I'm on Verizon with my M8. Whenever I take a picture and text it to anyone with an AT&T phone, they say the picture doesn't come through. The same problem occurs whether its friends who have iPhones, or my gf who has an M8 on AT&T. Most of the time its with a picture that's in the 800kb-1200kb size range, usually a screen shot or a camera pic taken and attached to the text message. I didn't have this problem with my Rezound. Is this an issue with AT&T?