Annette bought a new iPhone 5 and she can't send pics to her friends running Android through text messages. Leo says that since Annette is using an iPhone on T-Mobile, the phone isn't configured right for iMessages, is getting confused and won't default to MMS. Here's a technote from T-Mobile. There's also a youtube video that will walk her through it called How To Fix MMS on iOS 6/6.0.1 iPhone 5/4S/4/3Gs Tmobile.
The chatroom suggests turning off iMessage, then turn MMS off and on, then return to iMessage. That may fix it.