os version??? i m sorry but i m very new with this phone. just bought it few days back so dont know much about it and its features...
Its like while writting a text i get those small keypads so thought may be if i go into the landscape mode then i'll get the bigger keypads for typing.
Tap your home button twice, to bring up the multitask window, swipe to the right until your screen looks like this. The button on the far left is your screen orientation lock. If it has a lock in it like the pic, press it and it will unlock your screen. If it is locked, you will also see the icon at the top of your screen in the status bar.