So I upgraded my iphone 4 to an iphone 6 a while ago and now my son wants to use that for when he goes to track meets as he does not have a phone and needs to contact me when the meet is over. Thing is, i'm not sure what will happen if I do. They re connected to the same apple ID so when I turn on my old one I know the new one doesn't get notifications until I turn it off again but will I have to pay more for the cell phone bill? Will messages even work? What will happen
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