Just got a new iphone 5 through T-Mobile and am having a rather weird issue...I can't text some people (no one in particular and very random, maybe every 8 people) and they can't text me cause my number comes up as a landline. How can this be? I gave my new number to people and they tried to text me and then sent me messages on facebook and twitter asking if it was a real number cause it comes back as an error saying it's a landline. I've called both Apple and T-Mobile and I get the same thing, each saying it's the others problem. What are your thoughts?