I want to give my Iphone to my sister, but it does not work with her SIM card

As far as I am aware, the phone was not locked to a particular network but never the less - the phone was bought on T-Mobile UK and she is trying to use a T-Mobile UK sim card. I wiped the phone before giving it to her. However, it is not working! Do I need to inform apple that I have given this device to somone else and they should be 'allowed' to acess the device. Do Iphones lock them seleves to one partuclaur sim card? I replaced the Iphone at the Apple store due to dropping it in some cofee.. would this of caused them to register my device to my sim in particular?
Thanks for your help.

If you are both on the T-mobile network, the sim card should work.  If you did a Erase All Content and Settings, then she should be at the point of activation as a new device...talk to T-mobile and be sure the sim she is using is a valid sim card.

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