I just bought my iPhone 5 last friday from celcom. My iPhone uses a proper nano sim from celcom, while my one x uses a micro sim cut from a Celcom normal sim. Enabled 3G on settings in iPhone but this happened. Rebooted/airplane mode multiple times but to no avail. Any tips?

P/S: signal not strong enuf is BS coz my one x is riding on HSDPA all the time. Don't even have to force it in the settings. This is the only thing thats stopping me from enjoying my iPhone as a daily driver so if you have any tips, do share.

I googled about Auto3G and from what i can understand, it turns off 3G when you lock your phone to conserve battery life. Can we actually use it to force iPhone to connect to 3G all the time? Like how android can force the modem to connect to 3G/HSDPA?

I'm on iOS 6.1 now. Can i grab the 6.1.2 update somewhere and use it to update my iPhone before i jailbreak? Because 6.1.3 is out and no jb for it

BTW do you happen to know any good theme sites? So far only Jaku catches my eye. The last apple product i JB'd was an ipod 2G so its been a very long time. No idea what happened to the theming scene (long live Dulce theme)

Alrighty. will proceed with jailbreak and buy auto3g. I just pray it can get the 3G signal back or its my cash down the drain lol

Running Auto3G (Cydia Tweak) on iPhone 5, iOS 6.1. I can confirm that the force 3G option works, FULL BAR. Why the hell this was a problem in the first place, i dont even know. WTH Apple?

Thank you to all who helped, especially Memories_Fallen!