I am having some problems with texting on my new iPhone. I am able to send text messages to all of my friends back and forth, but for some reason, I can receive texts from my gf but she can't recieve my texts. What I don't get is the fact that she is having no problems getting texts from other people, it's just me. What might be the issue with this? I am completely confused why I can receive her texts, but she can't receive mine.