This started about 4 days ago, I can't text message my girlfriend. Wah wah, I know, but i can receive texts from her. I can send and receive texts from everyone, except I can't reply to her via text. I tried the 228 thing, I've shut off my phone, removed battery and whatnot, any other ideas? Or should I just be calling customer service by now?
If you can send and recieve text's to anyone but her, it may be a problem with her device? I would have her do the same things that you did (*228, Resetting the phone, etc) and see if that resolves the issue. Is she a Verizon Wireless subscriber? If not, she should check with her carrier to see if its an issue on her side.