Apple Iphone 3gs 16gb White Unlocked more. Although these have a good share of updates, users have complained of a number of other frustrating issues and errors that have occurred in their iOS devices as a result of the update. There are several ways that the iPhone touch screen may have problems. Although there are times when the screen is not working, there are other situations where certain areas of the screen work and others do not. However, if you are on a European vacation or if you avoid downloading these iPhone updates, you can use the SIM cards of other mobile operators on iPhone, provided that these providers also use the GSM mobile frequencies. The digitizer connector was definitely the reason for my temporary touch sensitivity and vertical white lines. Apple Store Tech could not solve this problem, which indicates that I had a bad logic card connector. The next instructions require that you download some programs from the Internet to iPhone. Unlock Iphone 5s Straight Talk Free. Make sure that your iPhone is connected to a WiFi network.