Tips Samsung Galaxy Pocket GTs5300 questions (Haalp)

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http://androidforums.com – okay so got my 1st android - Samsung Galaxy Pocket GTs5300. and trying to set it up(read=fidgeting) i encountered some minor problems, mostly due to this being new to me. 1) how to end calls i make (no i dont feel silly at all askin this :P,this is where u lol :P ) actually my screen turns off while im talking so when i finish talkin i have to unlock it and then end call so my querry ----- any shortcut exists/can be created to end calls ? 2) cannot enable 3g :- dont see any 2g/3g options in settings> wireless and network settings > mobile networks i see use packet data and/data roam (General)