I am very curious and jealous on some of the members' SOT which can reached ard 4 to 5 hours. Is 3g on all the time?

Mine, from 7am to 6pm 3g on only manage to give me 2 1/2 hours SOT, the most. Only using for whatsapping, a few calls.

I am not into doing all kind of stuff to save battery as I belief the phone should serve me but not otherwise. But i am just curious. 4 hrs vs 2 1/2 hrs!

Can someone enlighthen me?

Will grab an extra battery and charging dock once its available in Samsung Strore.