Can't Send/Receive MMS: Mobile Phone Troubleshooting
There may be a number of reasons why MMS / picture messages are not working. To get to the bottom of the problem as quickly as possible try these troubleshooting steps.
If you have less than optimal reception the delivery time of MMS may be increased or result in a higher chance of the MMS failing to send. Check the mobile coverage/reception indicator on your handset. You should have a steady 1 to 2 (or more) bars of 2G, 3G or 4G coverage.