I have contacted support for my iPhone and that does not seem to be the issue. I sometimes recieve several messages all at once 30+ mins after they are sent, if I even get them. I have sat next to a friend who sent me a message that I didn't receive for several minutes and when I tried to respond I could not send them them the message. I have trouble sending to ATT users too. I use my phone for work and other coworkers are experiencing similar issues (on verizon). Please help before I switch to a more reliable service. I am in Boston MA and should have great service. Missing texts and being unable to send is highly annoying and affecting my work. Please help!