I'm receiving my friend's messages?

My friend borrowed my phone and put her SIM card in it at the weekend but when she returned it she took out her SIM card and I put mine back in. For some reason though, I'm receiving any texts she gets from iPhones through iMessage and she's not receiving them so she can't talk to anyone with an iPhone because I get the messages instead of her. Any idea why this is happening or how to stop it?

She is signed in with her apple id to your phone still

Silly billy, it is the Telephone Number that receives the messages, her SIM card assumed Your number, and her automatic Log-In for her emails/mobile phone contacts.
The SIM card is only a Key for access via the providers servers.

Give or sell the phone to her and buy a new one.
What kind of SCAM was she pulling by using your phone anyway…

I Said it before and i'll say it again, ipones suk

Probably to do something with iMessage, make sure your friend didn't accidentally put back their sim card in your own phone.

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