| API | Description | Category | Date |
|---|---|---|---|
| GSMA OneAPI MMS | Mobile messaging services | Messaging | 2012-02-20 |
| HDmessaging | Mobile messaging service | Messaging | 2011-07-28 |
| Heello | Microblogging service | Social | 2012-05-29 |
| Hisign | SMS text messaging service | Messaging | 2012-08-09 |
| Hoiio SMS | Global SMS API | Messaging | 2011-08-19 |
| Hook Mobile | U.S. and Canada multimedia mobile messaging service | Messaging | 2008-04-12 |
| HQSMS | Bulk SMS messaging service | Messaging | 2011-09-26 |
| HummingBytes Q&A | Communication service | Telephony | 2010-10-20 |
| iCall | Calling, VoIP, and messaging service | Telephony | 2011-11-15 |
| IIG Alerts | Voice, SMS and Email messaging | Messaging | 2008-10-15 |
| Infobip | Mobile messaging and solution service | Telephony | 2011-11-21 |
| Integrity Infotech Bulk SMS | SMS gateway service | Messaging | 2012-08-24 |
| IntelePeer | Telephony From the Cloud Service | Telephony | 2009-03-28 |
| Intouch | Mobile group messaging | Messaging | 2010-12-15 |
| Inviosmart | Italian bulk SMS service | Messaging | 2013-01-15 |
| InVox | Small and medium-sized business phone service | Telephony | 2011-11-23 |
| Its4sms | SMS messaging service | Messaging | 2011-11-30 |
| iVisionMobile | SMS gateway service | Telephony | 2011-11-30 |
| Jajah | International Web Telephony Service | Telephony | 2010-12-13 |
| Kinross Group | SMS messaging service | Messaging | 2011-11-03 |
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