Has anyone had trouble sending/receiving text messages? For the past 2 weeks, I haven't been able to send or receive msgs with my brother (he has an iPhone w/ AT&T). We'd been texting up until July 4th without an issue - but now nothing.. I of course thought it was an issue with his phone and not my less than 2 month old HTC One - but today another friend told me she didn't get my text msg - she has a HTC Evo with Sprint. Any suggestions? Thanks