I am trying to iMessage an iPhone 4S using its phone number. When I press send, the sending progress runs to ~90% and pauses. Then, after about 1-2 minutes, a red exclamation point appears. This happens every time. My WiFi connection is great. What's the problem? I have a 16 GB iPad WiFi running iOS 5.
IPad – iMessaging an iPhone from an iPad
ipadmessageswifi
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Best Answer
Why not try iPhone's email address? As far as I know, iMessage is registered by e-mail, not phone number.