What is the difference between AgentPhone and Comms by Osis?

AgentPhone supports 44 of the 77 features compared here, and Comms by Osis supports 43. AgentPhone adds message effects, TypeScript SDK, Python SDK, local testing and agent framework integrations. Comms by Osis adds read receipts, edit and unsend, polls, location sharing and FaceTime calls.

How much do AgentPhone and Comms by Osis cost?

AgentPhone: Pay as you go with $5 of starting credit: $3 per number a month, $0.13 to $0.22 a voice minute and $0.02 per SMS segment, with iMessage lines at $150 or $250 a month and no per-message charge. Comms by Osis: Free on a shared line with 100 messages a day, Plus at $50 a month on a shared line, Dedicated at $200 a month per number with $0 setup, and custom Enterprise; AI usage is billed separately.

Does Comms by Osis support message effects?

Comms by Osis does not list message effects on its site or in its docs.

Does Comms by Osis support TypeScript SDK?

Comms by Osis does not list TypeScript SDK on its site or in its docs.

Does Comms by Osis support Python SDK?

Comms by Osis does not list Python SDK on its site or in its docs.

AgentPhone vs Comms by Osis

Compare AgentPhone and Comms by Osis side by side: iMessage features, channels, developer tools, pricing and compliance, checked on each provider's own site.

AgentPhone

Phone numbers with voice, SMS and iMessage for AI agents

Starting price: $3/month per number plus usage; iMessage from $150/month per line
Free plan: $5 starting credit, no card required

Visit AgentPhone Read more

Comms by Osis

iMessage, RCS, SMS and WhatsApp API with hosted agents

Starting price: $50/month (shared line); $200/month per dedicated number
Free plan: Free: shared platform line, 100 messages a day, no card

Visit Comms by Osis Read more

AgentPhone supports 44 of the 77 features compared here, and Comms by Osis supports 43.

Where AgentPhone is ahead

and 1 more in the table below.

Where Comms by Osis is ahead

Feature comparison

Feature	AgentPhone	Comms by Osis
iMessage messaging
iMessage	SupportediMessage lines are a separate number type (type=imessage).	Supported
Group chats	SupportediMessage groups arrive as one conversation with roster and sender; reply to the group id.	SupportedGroups of 2 to 31 people from a dedicated line with group support. Not on the shared line.
Group management	PartialStart a new group by listing recipients and rename it; adding or removing members is not documented.	PartialCreate a group with its first message; adding or removing members is not documented.
Group name and photo	PartialGroup name can be set by API; the group icon is only readable.	PartialName a group when you create it; group photos and renames are not documented.
Mentions	Not listed	Not listed
Tapbacks	SupportedSix classic tapbacks, custom emoji on newer lines; inbound reactions via agent.reaction.	SupportedClassic tapbacks or custom emoji, add, replace or remove; reaction webhooks for inbound.
Threaded replies	Supportedreply_to_message_id; also on WhatsApp.	Supportedreply_to_message_id replies inside an iMessage thread; text only.
Typing indicators	SupportedSend only, best-effort, auto-expires after a few seconds.	SupportedShow or hide typing dots on iMessage, RCS and WhatsApp.
Read receipts	Not listedThe pricing page mentions read receipts; no API or webhook for them is documented.	SupportedMark a conversation read to send a receipt; comms.message.read for one-to-one chats.
Edit and unsend	Not listed	PartialUnsend within Apple's 2-minute window on supported lines. No edit endpoint; inbound edits fire events.
Message effects	Supported12 screen and bubble effects via send_style.	Not listed
Animated text effects	Not listed	Not listed
Stickers	Not listed	Not listed
Formatted text	Not listed	Not listed
Attachments	SupportedImages, video and files by URL; several images arrive as a carousel on iMessage.	SupportedUp to 32 files and 9 MiB per message, sent as base64.
Live Photos	Not listed	Not listed
Rich link previews	Not listed	Not listed
Voice messages	Not listed	Not listedVoice notes are documented for WhatsApp only.
Contact cards	SupportedvCard files can be sent as media (listed as a supported MMS type).	SupportedSend a vCard over iMessage, SMS or WhatsApp.
Polls	Not listed	Supported2 to 12 options; votes arrive as comms.poll.voted. Tap to vote on iOS 26 and later.
Chat backgrounds	SupportedSet or remove a background image per iMessage conversation.	BetaExperimental: photo or gradient backgrounds on lines that support them.
Location sharing	Not listedThe API has location endpoints returning coordinates per number, but their use is not described.	PartialRead locations that contacts choose to share, with update webhooks; the API cannot request a share.
iMessage apps	Not listed	Not listed
Live app cards	Not listed	Not listed
Sender name and photo	PartialContact card sets a display name and avatar on the iMessage number; $250/month line only.	SupportedContact card API sets name and photo, with native name and photo sharing on supported lines.
FaceTime calls	Not listed	PartialAnswer inbound FaceTime audio and video calls by API and stream audio; outbound calls not documented.
Delivery status	PartialMessages carry a status and failure reason; no delivery or read webhooks are documented.	Supportedsent, delivered and read events, plus a list of delivery attempts.
iMessage availability check	SupportedLive check of iMessage, SMS and RCS reachability for a number before sending.	SupportedChecks iMessage, RCS and WhatsApp for a phone number, or iMessage for an email.
Focus and Notify Anyway	Not listed	Not listed
Numbers and delivery
Managed lines	SupportediMessage lines are ordered through the API and run by AgentPhone.	SupportedHosted lines; no Mac to run.
Dedicated numbers	SupportedUS and Canada numbers at $3/month; dedicated iMessage lines at $250/month.	SupportedDedicated plan: $200 a month per number.
Shared numbers	Not listed	SupportedFree and Plus plans run on a shared platform line.
Bring your own number	Not listed	SupportedPort an existing number to a dedicated line; needs approval and a supported number.
Line pooling	Not listed	Not listed
SMS fallback	SupportedFalls back to SMS/MMS when iMessage is not available.	SupportedAuto routing falls back to SMS only after a clear rejection.
RCS fallback	SupportediMessage-capable numbers deliver over RCS or SMS to non-Apple recipients.	PartialAuto routing tries RCS for plain text on supported dedicated lines with carrier enablement.
Outbound-first messaging	PartialOutbound iMessage lines: 50 new contacts a day per line; inbound-only lines do not start chats; SMS needs 10DLC.	SupportedDedicated lines can start conversations.
Calls on the iMessage number	Not listed	PartialInbound phone and FaceTime calls to the line can be answered by API; outbound is not documented.
Other channels
SMS	SupportedSMS and MMS; inbound works at once, outbound needs 10DLC.	SupportedChoose sms explicitly or let auto routing fall back to it.
RCS	BetaRCS Business Messaging is beta and concierge-onboarded: branded sender, quick-reply chips.	PartialOne plain-text message to one number, on supported dedicated lines with carrier enablement.
WhatsApp	BetaBeta, enabled per account. Connect your own WhatsApp Business Account; Meta bills you.	SupportedSends from the number's WhatsApp Business account when WhatsApp is turned on for it.
Telegram	Not supportedNot offered	Not supportedNot offered
Slack	Not supported	Not supported
Email	Not supported	Not supportedNot offered as a channel; the capability check accepts Apple ID emails for iMessage.
Phone calls	SupportedInbound and outbound calls in webhook mode or hosted AI mode; also browser web calls.	PartialInbound cellular calls can be answered by API, but audio relay works only for FaceTime for now.
Apple Messages for Business	Not supportedNot offered	Not supportedNot offered; the site says Comms is distinct from Apple Messages for Business.
Unified channel API	SupportedOne send endpoint for SMS, MMS, iMessage, RCS and WhatsApp; one agent.message webhook incl. voice.	SupportedOne send endpoint and message model for iMessage, RCS, WhatsApp and SMS.
Developer tools
REST API	Supported	Supported
TypeScript SDK	Supportednpm install agentphone	Not listedOnly a runnable Node.js example is published.
Python SDK	Supportedpip install agentphone	Not listed
Other SDKs	Not listedDocs list only TypeScript and Python; an agentphone-go repo holds only a placeholder README.	Not listed
CLI	Not listedNo own CLI found; numbers can be provisioned through the Stripe Projects CLI.	Not listed
Webhooks	SupportedProject default webhook with per-agent overrides.	Supported
Signed webhooks	SupportedHMAC-SHA256 over timestamp and body, with a timestamp header for replay protection.	SupportedHMAC-SHA256 in X-Osis-Signature.
MCP server	SupportedHosted MCP server (mcp.agentphone.ai) and npm package agentphone-mcp.	SupportedHosted MCP server with OAuth or a scoped API key.
Open source	Not supportedClosed platform. The MCP server and framework integrations are MIT-licensed on GitHub.	Not listed
Self-hosting	Not supportedHosted cloud service only	Not listed
Local testing	PartialBrowser web calls test a voice agent without a phone number; no message simulator found.	Not listed
Custom channel providers	Not listed	Not listed
Event replay	PartialFailed webhooks retry 5 times over about 20 hours; deliveries can be listed but not replayed.	PartialUp to six delivery retries and a delivery attempts list; no replay endpoint is documented.
OpenTelemetry	Not listed	Not listed
No-code integrations	PartialAgentPhone block in Sim's no-code workflow builder; no Zapier, Make, n8n or GoHighLevel found.	BetaHighLevel connector is a development preview; Marketplace approval is pending.
CRM integrations	Not listed	Not listed
Built for AI agents
Agent framework	SupportedHosted voice mode runs calls from a system prompt; conversation state rides along in webhooks.	SupportedHosted agents with instructions, knowledge, handoff and MCP tool connections.
Agent framework integrations	SupportedVercel Chat SDK adapter, LangChain, CrewAI and OpenAI Agents SDK tools, Google ADK guide.	Not listed
Streaming replies	PartialVoice only: NDJSON streamed webhook replies start speech on the first chunk.	Not listed
Agent group chats	PartialAgents can create and take part in iMessage groups; agent-to-agent groups are not described.	Not listed
Human handoff	PartialVoice only: cold transfer of a call to a transferNumber, by the AI or your webhook.	SupportedHandoff controls pause the hosted agent while a person replies in the team inbox.
Audit logs	Not listed	Not listed
Message history API	SupportedConversations with paginated messages and custom metadata; call transcripts.	SupportedList messages and conversations on your lines.
Plans and compliance
Free plan	Partial$5 starting credit, no card. Outbound calls need a top-up first.	SupportedFree: shared platform line, 100 messages a day, no card.
Public pricing	Supported	Supported
No per-message fees	PartialiMessage lines and WhatsApp have no per-message charge; SMS is $0.02 a segment, MMS $0.03.	SupportedFlat plans; AI usage and answered call minutes are billed separately.
Uptime SLA	Not supportedTerms promise no uptime; SLAs only if set in an order or separate agreement.	Not listed
Isolated infrastructure	Not listedSub-accounts isolate agents, numbers and data per client; no dedicated infrastructure offer found.	Not listed
SOC 2 Type II	PartialSOC 2 Type I report as of July 30, 2026; Type II examination in progress.	Not listed
GDPR	SupportedPrivacy policy sets out GDPR legal bases for processing.	Not listedThe privacy policy mentions GDPR rights; no DPA was found.

Feature

AgentPhone

Comms by Osis

iMessage messaging

iMessage

iMessage lines are a separate number type (type=imessage).

Group chats

iMessage groups arrive as one conversation with roster and sender; reply to the group id.

Groups of 2 to 31 people from a dedicated line with group support. Not on the shared line.

Group management

PartialStart a new group by listing recipients and rename it; adding or removing members is not documented.

PartialCreate a group with its first message; adding or removing members is not documented.

Group name and photo

PartialGroup name can be set by API; the group icon is only readable.

PartialName a group when you create it; group photos and renames are not documented.

Mentions

Not listed

Tapbacks

Six classic tapbacks, custom emoji on newer lines; inbound reactions via agent.reaction.

Classic tapbacks or custom emoji, add, replace or remove; reaction webhooks for inbound.

Threaded replies

reply_to_message_id; also on WhatsApp.

reply_to_message_id replies inside an iMessage thread; text only.

Typing indicators

Send only, best-effort, auto-expires after a few seconds.

Show or hide typing dots on iMessage, RCS and WhatsApp.

Read receipts

Not listedThe pricing page mentions read receipts; no API or webhook for them is documented.

Mark a conversation read to send a receipt; comms.message.read for one-to-one chats.

Edit and unsend

Not listed

PartialUnsend within Apple's 2-minute window on supported lines. No edit endpoint; inbound edits fire events.

Message effects

12 screen and bubble effects via send_style.

Not listed

Animated text effects

Not listed

Stickers

Not listed

Formatted text

Not listed

Attachments

Images, video and files by URL; several images arrive as a carousel on iMessage.

Up to 32 files and 9 MiB per message, sent as base64.

Live Photos

Not listed

Rich link previews

Not listed

Voice messages

Not listed

Not listedVoice notes are documented for WhatsApp only.

Contact cards

vCard files can be sent as media (listed as a supported MMS type).

Send a vCard over iMessage, SMS or WhatsApp.

Polls

Not listed

2 to 12 options; votes arrive as comms.poll.voted. Tap to vote on iOS 26 and later.

Chat backgrounds

Set or remove a background image per iMessage conversation.

BetaExperimental: photo or gradient backgrounds on lines that support them.

Location sharing

Not listedThe API has location endpoints returning coordinates per number, but their use is not described.

PartialRead locations that contacts choose to share, with update webhooks; the API cannot request a share.

iMessage apps

Not listed

Live app cards

Not listed

Sender name and photo

PartialContact card sets a display name and avatar on the iMessage number; $250/month line only.

Contact card API sets name and photo, with native name and photo sharing on supported lines.

FaceTime calls

Not listed

PartialAnswer inbound FaceTime audio and video calls by API and stream audio; outbound calls not documented.

Delivery status

PartialMessages carry a status and failure reason; no delivery or read webhooks are documented.

sent, delivered and read events, plus a list of delivery attempts.

iMessage availability check

Live check of iMessage, SMS and RCS reachability for a number before sending.

Checks iMessage, RCS and WhatsApp for a phone number, or iMessage for an email.

Focus and Notify Anyway

Not listed

Numbers and delivery

Managed lines

iMessage lines are ordered through the API and run by AgentPhone.

Hosted lines; no Mac to run.

Dedicated numbers

US and Canada numbers at $3/month; dedicated iMessage lines at $250/month.

Dedicated plan: $200 a month per number.

Shared numbers

Not listed

Free and Plus plans run on a shared platform line.

Bring your own number

Not listed

Port an existing number to a dedicated line; needs approval and a supported number.

Line pooling

Not listed

SMS fallback

Falls back to SMS/MMS when iMessage is not available.

Auto routing falls back to SMS only after a clear rejection.

RCS fallback

iMessage-capable numbers deliver over RCS or SMS to non-Apple recipients.

PartialAuto routing tries RCS for plain text on supported dedicated lines with carrier enablement.

Outbound-first messaging

PartialOutbound iMessage lines: 50 new contacts a day per line; inbound-only lines do not start chats; SMS needs 10DLC.

Dedicated lines can start conversations.

Calls on the iMessage number

Not listed

PartialInbound phone and FaceTime calls to the line can be answered by API; outbound is not documented.

Other channels

SMS

SMS and MMS; inbound works at once, outbound needs 10DLC.

Choose sms explicitly or let auto routing fall back to it.

RCS

BetaRCS Business Messaging is beta and concierge-onboarded: branded sender, quick-reply chips.

PartialOne plain-text message to one number, on supported dedicated lines with carrier enablement.

BetaBeta, enabled per account. Connect your own WhatsApp Business Account; Meta bills you.

Sends from the number's WhatsApp Business account when WhatsApp is turned on for it.

Not supportedNot offered

Slack

Not supported

Not supportedNot offered as a channel; the capability check accepts Apple ID emails for iMessage.

Phone calls

Inbound and outbound calls in webhook mode or hosted AI mode; also browser web calls.

PartialInbound cellular calls can be answered by API, but audio relay works only for FaceTime for now.

Apple Messages for Business

Not supportedNot offered

Not supportedNot offered; the site says Comms is distinct from Apple Messages for Business.

Unified channel API

One send endpoint for SMS, MMS, iMessage, RCS and WhatsApp; one agent.message webhook incl. voice.

One send endpoint and message model for iMessage, RCS, WhatsApp and SMS.

Developer tools

REST API

TypeScript SDK

npm install agentphone

Not listedOnly a runnable Node.js example is published.

Python SDK

pip install agentphone

Not listed

Other SDKs

Not listedDocs list only TypeScript and Python; an agentphone-go repo holds only a placeholder README.

Not listed

CLI

Not listedNo own CLI found; numbers can be provisioned through the Stripe Projects CLI.

Not listed

Webhooks

Project default webhook with per-agent overrides.

Signed webhooks

HMAC-SHA256 over timestamp and body, with a timestamp header for replay protection.

HMAC-SHA256 in X-Osis-Signature.

MCP server

Hosted MCP server (mcp.agentphone.ai) and npm package agentphone-mcp.

Hosted MCP server with OAuth or a scoped API key.

Open source

Not supportedClosed platform. The MCP server and framework integrations are MIT-licensed on GitHub.

Not listed

Self-hosting

Not supportedHosted cloud service only

Not listed

Local testing

PartialBrowser web calls test a voice agent without a phone number; no message simulator found.

Not listed

Custom channel providers

Not listed

Event replay

PartialFailed webhooks retry 5 times over about 20 hours; deliveries can be listed but not replayed.

PartialUp to six delivery retries and a delivery attempts list; no replay endpoint is documented.

OpenTelemetry

Not listed

No-code integrations

PartialAgentPhone block in Sim's no-code workflow builder; no Zapier, Make, n8n or GoHighLevel found.

BetaHighLevel connector is a development preview; Marketplace approval is pending.

CRM integrations

Not listed

Built for AI agents

Agent framework

Hosted voice mode runs calls from a system prompt; conversation state rides along in webhooks.

Hosted agents with instructions, knowledge, handoff and MCP tool connections.

Agent framework integrations

Vercel Chat SDK adapter, LangChain, CrewAI and OpenAI Agents SDK tools, Google ADK guide.

Not listed

Streaming replies

PartialVoice only: NDJSON streamed webhook replies start speech on the first chunk.

Not listed

Agent group chats

PartialAgents can create and take part in iMessage groups; agent-to-agent groups are not described.

Not listed

Human handoff

PartialVoice only: cold transfer of a call to a transferNumber, by the AI or your webhook.

Handoff controls pause the hosted agent while a person replies in the team inbox.

Audit logs

Not listed

Message history API

Conversations with paginated messages and custom metadata; call transcripts.

List messages and conversations on your lines.

Plans and compliance

Free plan

Partial$5 starting credit, no card. Outbound calls need a top-up first.

Free: shared platform line, 100 messages a day, no card.

Public pricing

No per-message fees

PartialiMessage lines and WhatsApp have no per-message charge; SMS is $0.02 a segment, MMS $0.03.

Flat plans; AI usage and answered call minutes are billed separately.

Uptime SLA

Not supportedTerms promise no uptime; SLAs only if set in an order or separate agreement.

Not listed

Isolated infrastructure

Not listedSub-accounts isolate agents, numbers and data per client; no dedicated infrastructure offer found.

Not listed

SOC 2 Type II

PartialSOC 2 Type I report as of July 30, 2026; Type II examination in progress.

Not listed

GDPR

Not listedThe privacy policy mentions GDPR rights; no DPA was found.

Checked on each provider's own site and docs on 2026-10-25. “Not listed” means the provider does not mention it.

Pricing

AgentPhone

Pay as you go with $5 of starting credit: $3 per number a month, $0.13 to $0.22 a voice minute and $0.02 per SMS segment, with iMessage lines at $150 or $250 a month and no per-message charge.

Pricing model: usage-based, flat per line for iMessage

Source

Comms by Osis

Free on a shared line with 100 messages a day, Plus at $50 a month on a shared line, Dedicated at $200 a month per number with $0 setup, and custom Enterprise; AI usage is billed separately.

Pricing model: flat monthly per plan or dedicated line; AI usage and call minutes extra

Source