I'm using a prepaid GoPhone, an LG PrimeGS390. In the last few days, I've noticed that a large percentage of my texts to one of my friends have not been recieved. Within the last two days, of the four texts I've sent, I've gotten only one text through to her (ironically, it was asking if she'd gotten my text from earlier that morning. She hadn't.) I have no trouble getting through to anyone else, and I've been able to recieve all of her texts. I've been an AT&T customer for almost a year now, and have never had this kind of problem before. Is this a problem with my network or hers (I'm not sure what she's using, but I don't think she's an AT&T customer)? Is there anything I can do to fix it?