Carrier support for MMS messages varies, and is dependent on the receiving carrier. 

MMS from Long Code (10-digit) numbers

Currently, Telair supports sending MMS messages from local long code numbers to the following mobile carriers in Canada and the US.

Major supported carriers: AT&T, Verizon, T-Mobile, Sprint, Rogers, Bell, Fido, Telus, Wind Canada

Minor supported carriers: 365 Wireless, Alaska Communication System (ACS), Advantage Wireless, Alltel Wireless, Bluegrass Cellular, Boost Mobile, Carolina West Wireless, Cellcom, Cellular South, Clear Talk Wireless, Commnet Wireless, Copper Valley Telecom, CTC Telecom, GCI Wireless, Google Voice, Illinois Valley Cellular, Inland Cellular, James Valley Communications, Leaco, MetroPCS, MTA Communications, NewCore Wireless, Nex-Tech Wireless, Panhandle Communications, Peoples Wireless, Pine Cellular, Pinpoint Communications, Southern Linc, SRT Communications, Standing Rock Telecom, Thumb Cellular, Simmetry (TMP Corporation), United Wireless

What happens when I send an MMS to an unsupported carrier?

When you send an MMS message to an unsupported carrier, Telair will send the message as an SMS with a shortened URL in the body, linking to your media. 

The URL (http://m.sipstack.com followed by 7 characters) will be appended to the body of your SMS text message.