Fonix

Overview

Fonix (Fonix PLC, incorporated in England) is a mobile payments and messaging company. It runs a Messaging API for SMS, carrier billing through charged SMS, and RichMessaging, its RCS product with verified branded profiles. Fonix describes itself as a tier 1 messaging aggregator with direct connections to mobile networks.

Key features

• REST and SMPP APIs to send SMS from an alphanumeric sender ID, a mobile number or a short code
• Inbound (MO) SMS posted to your server, with long messages joined into one request
• Delivery reports, test API keys for dummy sends and an operator lookup call
• Charged SMS that bill the recipient's phone bill from premium short codes
• RCS with branded verified profiles, carousels, video, maps and quick replies
• Payment links inside RCS conversations, tied to your payment provider
• Campaign Manager for competitions, donations and interactive campaigns

Pricing

Not published. The site offers demos and contact with sales.

How it compares to Linq

Fonix offers SMS and RCS but no iMessage and no WhatsApp; Linq sends iMessage, RCS and SMS from real phone numbers. Fonix focuses on UK carrier billing, short codes and branded campaigns for media and charities, while Linq is built for apps and AI agents holding conversations, with a free Hobby tier and Pro from $260 a month. Fonix's SMS API can charge the recipient through their phone bill, which Linq does not offer.

Best for

UK media, charity and digital businesses that want SMS, RCS campaigns and phone-bill payments from one provider.

Sources

• fonix.com/products/richmessaging
• fonix.com/products/messaging-api
• fonix.com/documentation
• fonix.com/documentation/messaging-sms-billing-api