A message that consists of both text and pictures can transmit up to 10 images and 1,600 characters, as long as the entire message is under 5MB. 1,600 characters translate to 4.8KB, which accounts for roughly 1% of the message size limit with UTF-8 encoding.
Media file size limitations
For multimedia attachments, the file size limit for media_urls attachments depends on the receiving carrier.
File Size Guidelines for Top Four US-Based Carriers:
|
Carrier |
Long Code |
Toll-Free |
Short Code |
|
Operators |
MMS attachment size |
MMS attachment size |
MMS attachment size |
|
AT&T |
0.675MB |
0.750MB |
0.600MB |
|
Sprint |
1.400MB |
0.750MB |
1.400MB |
|
T-Mobile |
1.500MB |
0.750MB |
1.000MB |
|
Verizon |
0.675MB |
0.750MB |
1.200MB |
For other carriers within the US, we recommend using attachments no larger than 600KB when sending files that are not JPEG, PNG, or GIF images.
File Size Guidelines for Canadian Carriers:
In Canada, carriers recommend using MMS attachments smaller than 1MB across all networks. This guideline helps ensure broad compatibility and optimal delivery of multimedia messages across various mobile networks in Canada.