Not sure this is the right forum, but here's my problem - Updated from iPhone 4 to an iPhone 5S, and everything seemed fine. However, iMessages are being received really slow, or coming in as a kind of bulk (maybe 4-5 at a time). I disabled iMessage on my old phone, and did the deregister on the Apple website too - this improved it a little bit. I can see the person is "typing" with the dots that appear, then nothing received, then it might receive a few minutes later. What to do now? I am going to disable it for a while, then re-enable it to see if that helps. In the mean time, does anyone have any good suggestions, or has encountered such a problem when updating their phones to a new model? This is the same SIM card and same Apple ID (obviously).