Two accounts on 1 iphone 4s phone?

My girlfriend just got an iphone 4s and she might sell it bc she doesn't like it so i gave her my information to login to her new iphone so she can just test it out so she doesn't have to set up a new account… Anyways once she signs my user name and password on her iphone will it notify me on my iphone that someone is signing it? Will it allow it? And will she see all my text messages even from imessage and phoTos? Will it show her all my deleted text messages? Once she setups her iphone using my account information and she synces everything will it synce all the contacts and messages and pictures? Just curious to what all will happen i don't want it to lock my account or anything i'm okay with her useing my information or seeing my stuff.

It will share the pictures, if you have your cloud turned on. But she can't see text messages and such.

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