>> So how does iMessenger know what phone the recipient has by the number alone? Even
>> if they had had an iPhone they could have changed their phone.
The message app registers your mobile number in an Apple database. When you go to contact someone, it looks up whether that person is in the iMessage system, and knows to send via iMessage.
As it only works between Apple communication devices, the system knows whether the receiving device is or isn't an iPhone.
edit - more here
electronics.howstuffworks.com/how-does-my-iphone-know-when-person-texting-is-typing.htm
Last edited by: VxFan on Thu 9 Nov 17 at 12:55
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