I have just got this phone today from T-Mobile UK I have had lots of Samsung phones and have always been able to choose either GSM mode or 3g but on this phone there is not that choice anywhere and my phone because of the area I live in is forever searching for a good 3g signal and it's eating my battery, if I turn off my mobile data then I don't receive my notifications from facebook such as if one of my friends private messages me, is there any way that I can use just 2g (gsm) my battery won't last me half a day at this rate, thanks for any help....