i have unlimited text messages and when i first got my phone it would send to my girlfriends phone normally. i would send a text to her and it would get to her no problem in good time. she would send to me in good time to..everythng was fine...then lately it would take a long time for my text messages to get to her...but i could still get hers just fine...and now i try sending a text message and 98% of the time she doesn't get my messages. but she can still send to me just fine like always.....we havn't changed out plans or anything. this only happens with her. no one else...what could be the problem? what should i do?