Using iMessage

i have friend residing in uk. want send him messages using imessage without charges important hold of him has wifi unavailable send regular text message (paying time). want know how setup imessage can choose whether send message using imessage or regular international text. need both options available please guide me through.

 

wirelessly posted (iphone 4s)

send email address that's registered imessage if fails won't revert text message!

 

Forums iPhone, iPad, and iPod Touch iOS Older iOS Versions iOS 5 and earlier

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