Is it possible to ENABLE 3G ONLY Network on iPhone 4 Jailbreak? How to do that? Like we all know, iOS on iPhone 4 only have featured Enabled Network (GPRS, EDGE and 3G) and one another checkbox to enable 3G data. My Question is how to make my iPhone 4 only work on 3G Network? So when my location did't coverage 3G Network.. our Data Network will be disable. Is it possible?