I have a problem with my iphone? - 2

I will try to explain it as easy as I could.
My girlfriend gave me her iphone because she had recently purchased a new one.
So when I tried deleting her contacts on the one she gave me, it ended up deleting hers on the one she had purchased.
So anything I try deleting will erase hers.
I made an apple id and tried logging in on the phone but it would not let me either.
How can I fix it so I can put my information instead?
Without erasing her info?

Best way to go around this problem is to do complete restore of the iPhone in iTunes. See this apple help article

Just be on a safer side, connect the phone to iTunes and take a local manual backup first, so atleast you can restore to this stage if something goes wrong.

To avoid erasing her info like contact, text etc, you have to go to Settings -> iCloud and logoff her id from there. Also go to iTunes & Apps settings are log off from there too.

Then go to Settings -> General -> Reset option and use Erase all contents and settings. That would reset everything. Now you can setup your info on that.

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