Hello. A friend has an OLD iPhone, model MA712LL, ios 3.1.3 (7E18), firmware 04.05.04_G, that he wants to jailbreak/unlock so he can use a prepaid sim. Is it still possible to do this? I have a 4s that I jailbroke, which is, frighteningly, why he asked me how to do this, but that seems simple comparatively since I only had to press a button. Can anyone help or maybe point me in the right direction? Huge thank you!