Everything I download goes to my girlfriend's iPhone

Aug 16, 2011
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Fort mcmurray, alberta
#1
hey guys just got new phones yesterday upgraded from 3 to 4
but i've run into an issue, after getting everything set up and running everything i download onto my phone gets put on my gf's phone
but when she downloads something it stays only on her phone

is there any way to get my apps to stop going onto her phone?