I have 7.0.2 on my ATT 5s and I cannot no activate i get an "iMessage Activation: an error occured during activation" message when I try to add my itunes account email to activate iMessage. I've done the recommended (turn off facetime/imessage, reset network settings) but nothing works. I can send imessages using my cell # but I want integration like before with Messages app on Macbook where I can continue conversations on iphone/mac. My other cellphone number on ios 7.0 Verizon 4s is recognized on Messages under "Preferences/Accounts/" in the itunes account imessage option window. But there is no checkbox for my ATT number. What can I do? will 7.0.3. fix this?