My Iphone 3 won't accept my password

I switched Iphones with my dad, I switched the sim card correctly and everything. When I go to the app store down at the bottom it has the correct apple id info. But when i go and try to update an exsisting app it ask for the password to my dads apple id. I've gone into settings and it has my correct apple id. What do i do!

Ok do EXACTLY this:
When it asks for your dads password before you buy an app, where it says your dad's id, e.x.

id: dadblahblah
pass: ***

You can change where it says dadblahblahblah
Just click on it and change it to your id and then type your password in
Hope this helps.

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