OK guys since y'all know your stuff I will let you know I have FINALLY just FIXED mines after oh so long, reading through all of your methods & issues, well turns out that it is a hardware over software issue so after downgrading, upgrading so many times after another as you have probably done so already, I noticed that WiFi will come and go every time I booted on the latest version iOS 7.1.2 & of course I tried to activate it since I know it was unlocked already but still iTunes came back with an error that there was something wrong with my iPhone & to take it to a service center which some of you might be familiar with already, so since I noticed that WiFi coming & going I decided to leave it on my favorite iOS 5.0.1 GeekGrade .ipsw and so happens today I tethered booted but WITHOUT SIM CARD & SIM TRAY everything came back WIFI+CELLULAR+BLUETOOTH that is what has just worked for me hope it helps anyone
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