Currently Being ModeratedMar 30, 2013 5:32 PM (in response to amlindstrom614)
Messages to other iPhones is handled by iMessage. As amy_lou said, MMS is controlled by the carrier. Since Net10 is a MVNO and not a supported carrier, it requires you to have a phone that will handle that. Normally unlocked phones work better, but you can use an AT&T phone on some of them. You need to change the APN, and this can be difficulty if impossible with a phone that has a standard carrier file on it. You may have found this when updating this phone. You can try using the iPhone configuration utility to change them, and that download is free from Apple.