I had long wondered until I switched on a touch screen phone.
Have looked at some phones and have always come back to the key mobile ...
Until I got the S 2.
The S2 allows the transition, because you can change the Tasta on numeric keypad.
The menu navigation is self-explanatory.
Also one needs no separate navi more.
Shortcoming, as with all smartphones low battery life when you or other uses W-lan.
With mobile data usage still goes ...
Turn it on energy saving are max. 3 days possible with less usage.
Otherwise, the battery lasts about 2 days.
Plus: sync to Mac possible on gravel.
I am o2 users. Since the software update it is possible except that each of its contacts to a
Ringtone assigns to allocate also each own SMS tone. The feature I personally find funny.