My one-month old LG5 works perfectly. Except today, one of my regular contact's text start displaying a wrong number. (It's the identical phone number, except the area code is off by one digit.) When I hit reply and texted back, I got the "you've texted a landline, $0.15 applied" message, so it's clearly a real number (I checked... area code is in a different area of USA). Any idea how to fix that? It's worked normally, and I can't think of any reason why this happened.