Unlock From Samsung Galaxy S2 T-mobile (root)

Couple of days ago i got brand new samsung galaxy s2 gt-i9100. It was on t-mobile network but the seller said it can be unlocked to any network. I bought the phone from him and the same day i took it to a nearby phone shop for the unlock. After the process i saw a new application on my phone - superuser. I know the phone has been rooted which apparently voids the warranty.

The phone acts funky now - when i turn it off the display alternates between the large battery icon in the centre of the screen with 5 white dots below it and an empty battery icon with a yellow warning sign and a thermometer icon overlaid. By the looks of it the battery seems to be overheated but it is at room temperature. The phone can only be turned on if connected to a pc or a power source. I am going to try another battery tomorrow, hopefully it is only that.

If i will reset the phone to factory settings or delete superuser - will the unlock still be there? Or will the phone reject the simcard? I am not sure what to do, if battery replacement won't work then i will not have any other choice but to unroot the phone and send it to samsung. But does it mean that i will have to do the whole unlocking process again or will it be unlocked? Can someone help me please?

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