Hi guys ,

I need help about factory unlock if you guys have gone through the situation. I am currently using iphone 4 which is not factory unlocked but unlocked through gevy sim card. I am using tmobile service.My sim card was cut to smaller size, which sits on top of the gevy sim card and is working fine, but since ios is outdated, applications crash at times. I cannot upgrade ios.I want to factory unlock it.so that I can download latest apps.

Here is my concern
1.Will my phone work without any problem after factory unlock still with the gevy simcard or do i have to get a new sim card?
Have you guys have had this issue?

Thanks in advance.