Twilio MMS availability depends on the type of number you’re using, the carrier, and the country.
If you’re sending an MMS with a long code (10-digit number) from the US and Canada, you can send it through major carriers like AT&T, Verizon, T-Mobile, Sprint, Rogers, Bell, Fido, Telus, Wind Canada. See additional minor carriers here.
If you’re sending an MMS with a US Short Code that’s enabled for MMS, you can send it through major carriers like AT&T, Verizon, T-Mobile, Sprint, and US Cellular. However, Twilio short code numbers in non-US countries do not support MMS.
And if you do end up sending an MMS to an unsupported network, we have an MMS Converter feature to automatically convert your MMS to SMS so it can still be sent and received by your customer.