Only noticed this recently, where did the option to have GSM only in mobile network settings go? And why is 4G on by default? If I select wcdma only or wcdma/GSM when I next reboot my phone, it reverts back to 4G preferred. Is there a way to get this back? Or at least to not have 4G preferred? I don't have a 4G sim, so there's no need to have it on, I don't know if it effects battery life, but I'd assume it would?