AT&T.com is the source. They have a coverage map for voice, data, and GoPhone. GoPhone's map shows roaming.
Read the full thread and you will see that I did not. Context is key.
Actually it means you are mistaken. I have been working in the cellular industry for 15 years.
Obviously you and your friend had some type of data connection to send or receive MMS.
Some of the points made here are very valid. However, you can't compare your friends boost store to all of the rest. Same as you can't compare your Vzw store to the rest. Each market is different...