Help samsung galaxy SL

[rams1]

Hi all, im using Samsung Galaxy S GT-19003, i have a problems in tat, one is while using video call i cant able to switch to front camera,please can any one give idea regarding this. and also i want to know is there any upgrade software for using front camera in video call.. second one, battery life is too short, when i use GPS , its holding up-to only 4 hrs. please any one help me out of this.thanks.