I bought an iPhone 3G from South Africa, and I got it unlocked. I am now using it in Pakistan on a Ufone sim, and I'm wondering if I should update it to 2.2, but I'm scared it'll get locked, and its difficult to find someone to unlock it here. My last iPhone (1st gen) got locked and I was unable to unlock it using QuickPwn. Any tips on what I should do?