AgentPhone vs Linq

Compare AgentPhone and Linq 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

Linq

iMessage, RCS and SMS API with flat monthly pricing
Starting price
$260/month (Pro)
Free plan
Hobby: $0, up to 20 contacts, used through the CLI

AgentPhone supports 44 of the 77 features compared here, and Linq supports 63.

Feature comparison

FeatureAgentPhoneLinq
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.
SupportedPro plan. Up to 31 recipients. No read or delivery receipts in groups.
Group management
PartialStart a new group by listing recipients and rename it; adding or removing members is not documented.
SupportedAdd and remove participants and leave a group, iMessage groups only, 3-member minimum.
Group name and photo
PartialGroup name can be set by API; the group icon is only readable.
SupportedSet display_name and group_chat_icon on group chats.
Mentions
Not listed
SupportedGroup chats only. Notifies iMessage recipients even in a muted chat.
Tapbacks
SupportedSix classic tapbacks, custom emoji on newer lines; inbound reactions via agent.reaction.
SupportedSix classic tapbacks or any emoji, send and receive via reaction webhooks.
Threaded replies
Supportedreply_to_message_id; also on WhatsApp.
Supportedreply_to with optional part_index. iMessage only.
Typing indicators
SupportedSend only, best-effort, auto-expires after a few seconds.
SupportedSend and receive, in direct and group chats. iMessage only.
Read receipts
Not listedThe pricing page mentions read receipts; no API or webhook for them is documented.
SupportedMark chats read and receive message.read. One-to-one chats only.
Edit and unsend
Not listed
PartialEdit text up to 5 times within 15 minutes. Delete does not unsend from the recipient's device.
Message effects
Supported12 screen and bubble effects via send_style.
Supported11 screen and 4 bubble effects.
Animated text effects
Not listed
Supportedtext_decorations animations: big, small, shake, nod, explode, ripple, bloom, jitter.
Stickers
Not listed
SupportedPeel emoji or images onto messages, send stickers, or place them inline in text.
Formatted text
Not listed
SupportedBold, italic, underline and strikethrough ranges, plus animated text. iMessage only.
Attachments
SupportedImages, video and files by URL; several images arrive as a carousel on iMessage.
SupportedUp to 10MB by URL, 100MB with pre-upload.
Live Photos
Not listed
Not listed
Rich link previews
Not listed
Supportedlink parts render as rich previews on iMessage and RCS.
Voice messages
Not listed
SupportedDedicated voice memo endpoint renders the native iMessage voice bubble.
Contact cards
SupportedvCard files can be sent as media (listed as a supported MMS type).
SupportedSend .vcf files as media parts.
Polls
Not listed
SupportedCreate, add options, vote and read tallies, with poll webhooks. Not as a chat's first message.
Chat backgrounds
SupportedSet or remove a background image per iMessage conversation.
SupportedColor, animated or photo backgrounds, in direct and group chats.
Location sharing
Not listedThe API has location endpoints returning coordinates per number, but their use is not described.
SupportedRequest, read and stop Find My shares. Live location is a $79/mo add-on on Pro.
iMessage apps
Not listed
SupportedPro plan. Cards from your own Messages extension, or Linq-hosted cards (Experiences).
Live app cards
Not listed
SupportedUpdate App Card replaces a delivered iMessage app or Experience card in place.
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, shared per chat via Name and Photo Sharing.
FaceTime calls
Not listed
Not supportedDocs say the API does not place or answer calls.
Delivery status
PartialMessages carry a status and failure reason; no delivery or read webhooks are documented.
Supportedsent, delivered, read and failed webhooks. Groups report sent only.
iMessage availability check
SupportedLive check of iMessage, SMS and RCS reachability for a number before sending.
Supportedcheck_imessage and check_rcs endpoints.
Focus and Notify Anyway
Not listed
Not listed
Numbers and delivery
Managed lines
SupportediMessage lines are ordered through the API and run by AgentPhone.
Supported
Dedicated numbers
SupportedUS and Canada numbers at $3/month; dedicated iMessage lines at $250/month.
SupportedPaid lines are dedicated. Provisioned by Linq, no self-serve number API.
Shared numbers
Not listed
SupportedFree Hobby tier uses a Shared Line, inbound-first, 20 contacts.
Bring your own number
Not listed
Not listed
Line pooling
Not listed
SupportedManaged load balancing (Pro): send without from and Linq picks and fails over lines.
SMS fallback
SupportedFalls back to SMS/MMS when iMessage is not available.
Supported
RCS fallback
SupportediMessage-capable numbers deliver over RCS or SMS to non-Apple recipients.
SupportedOrder is iMessage, then RCS, then SMS.
Outbound-first messaging
PartialOutbound iMessage lines: 50 new contacts a day per line; inbound-only lines do not start chats; SMS needs 10DLC.
SupportedFree Hobby tier is inbound-first. Docs recommend inbound-first flows to avoid flagging.
Calls on the iMessage number
Not listed
PartialAPI forwards inbound calls on the line; outbound needs caller-ID masking via another provider.
Other channels
SMS
SupportedSMS and MMS; inbound works at once, outbound needs 10DLC.
Supported
RCS
BetaRCS Business Messaging is beta and concierge-onboarded: branded sender, quick-reply chips.
Supported
WhatsApp
BetaBeta, enabled per account. Connect your own WhatsApp Business Account; Meta bills you.
BetaSeparate WhatsApp API in beta. Access by request, no SLA.
Telegram
Not supportedNot offered
Not supportedNot offered
Slack
Not supported
Not supported
Email
Not supported
Not supportedNot offered. iMessage can be sent to Apple ID email handles.
Phone calls
SupportedInbound and outbound calls in webhook mode or hosted AI mode; also browser web calls.
PartialAPI does not place or answer calls; it forwards inbound calls. Calling lives in the Linq Blue app.
Apple Messages for Business
Not supportedNot offered
Not listedAI context page mentions it, but no product page or docs were found.
Unified channel API
SupportedOne send endpoint for SMS, MMS, iMessage, RCS and WhatsApp; one agent.message webhook incl. voice.
PartialiMessage, RCS and SMS share one API. WhatsApp is a separate API with its own keys and SDKs.
Developer tools
REST API
Supported
Supported
TypeScript SDK
Supportednpm install agentphone
Supported@linqapp/sdk
Python SDK
Supportedpip install agentphone
Supportedlinq-python
Other SDKs
Not listedDocs list only TypeScript and Python; an agentphone-go repo holds only a placeholder README.
SupportedOfficial Go SDK.
CLI
Not listedNo own CLI found; numbers can be provisioned through the Stripe Projects CLI.
Supported@linqapp/cli: signup, sending, and a local webhook listener.
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, Standard Webhooks format, with replay protection.
MCP server
SupportedHosted MCP server (mcp.agentphone.ai) and npm package agentphone-mcp.
Supported@linqapp/sdk-mcp with docs search and code execution tools.
Open source
Not supportedClosed platform. The MCP server and framework integrations are MIT-licensed on GitHub.
PartialSDKs, CLI and adapters are Apache-2.0 or MIT on GitHub. The messaging platform is closed.
Self-hosting
Not supportedHosted cloud service only
Not supportedLinq describes itself as fully managed, in contrast to self-hosted options.
Local testing
PartialBrowser web calls test a voice agent without a phone number; no message simulator found.
Not listedThe CLI streams webhooks locally, but tests still use a real phone.
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.
PartialRetries for 30 minutes; after that, re-fetch chats or ask Linq for a manual replay.
OpenTelemetry
Not listed
PartialW3C trace IDs on every response and webhook for OTel backends. No export of Linq spans by default.
No-code integrations
PartialAgentPhone block in Sim's no-code workflow builder; no Zapier, Make, n8n or GoHighLevel found.
SupportedLinq Blue works as a GoHighLevel messaging provider. No n8n, Make or Zapier found for the API.
CRM integrations
Not listed
SupportedVia Linq Blue: GoHighLevel, HubSpot and Salesforce.
Built for AI agents
Agent framework
SupportedHosted voice mode runs calls from a system prompt; conversation state rides along in webhooks.
PartialNo own framework. Maintains a Vercel Chat SDK adapter and OpenClaw and Hermes plugins.
Agent framework integrations
SupportedVercel Chat SDK adapter, LangChain, CrewAI and OpenAI Agents SDK tools, Google ADK guide.
SupportedLinq-maintained Vercel Chat SDK adapter, plus OpenClaw and Hermes Agent plugins.
Streaming replies
PartialVoice only: NDJSON streamed webhook replies start speech on the first chunk.
Not supportedDocs say the Chat SDK adapter buffers streams into one final message.
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.
Not listed
Audit logs
Not listed
SupportedDashboard Activity page plus account-change webhooks with actor and origin.
Message history API
SupportedConversations with paginated messages and custom metadata; call transcripts.
Supported
Plans and compliance
Free plan
Partial$5 starting credit, no card. Outbound calls need a top-up first.
SupportedHobby: $0, up to 20 contacts, through the CLI.
Public pricing
Supported
SupportedPro from $260/mo. Enterprise is custom.
No per-message fees
PartialiMessage lines and WhatsApp have no per-message charge; SMS is $0.02 a segment, MMS $0.03.
Supported
Uptime SLA
Not supportedTerms promise no uptime; SLAs only if set in an order or separate agreement.
SupportedContractual SLAs on the Enterprise plan; marketing cites 99.95%
Isolated infrastructure
Not listedSub-accounts isolate agents, numbers and data per client; no dedicated infrastructure offer found.
SupportedDedicated lines across 4 data centers on paid plans; Hobby uses a shared line
SOC 2 Type II
PartialSOC 2 Type I report as of July 30, 2026; Type II examination in progress.
SupportedType I and Type II, reports for 2022, 2024, 2025 and 2026.
GDPR
SupportedPrivacy policy sets out GDPR legal bases for processing.
SupportedDPA covers GDPR and UK GDPR, with Standard Contractual Clauses.

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

Linq

Hobby is free with up to 20 contacts through the CLI, Pro starts at $260 a month with a 7-day free trial, and Enterprise is custom.

Pricing model: flat monthly, no per-message fees

Source

Which should you choose?

Choose AgentPhone if you need local testing, streaming replies, agent group chats and human handoff.

Choose Linq if you need mentions, read receipts, edit and unsend and animated text effects.

Frequently asked questions