Roo!
Expert Member
It would be interesting to hear an "expert" opinion on this matter though. As you mentioned the phone would be checking cell towers for incoming calls etc all the time anyway so does it do anything different to check for any incoming or outgoing data? Or is it the same thing.
"Mobile Data" is UMTS or 3.x G (falling back to 2G when necessary), while GSM is 2G & 2.5G (EDGE). You can receive MMSes with GSM. The major battery drain happens when the handset flaps between 2G and 3G. In the bad old days of using a BB, if I left it on both (the default for most 'smartphones') then the battery would last maybe 2 days. If I set it to GSM only (which was my default setting as BIS was rubbish anyway) then I would get a full week.
It thus stands to reason that disabling "Mobile Data", thus forcing the phone to only use GSM, will indeed save battery power but will still allow most comms to run as required.
