Heh, What HD voice? Pakistan needs HD voice- Most phones have messed up ear pieces and I can see most people shouting lmao.
I only favor Three and Giffgaff because of their awesome deals.
I remember in student days, never had enough cash for Top-ups. Used to call Three's free helpline(Indian dudes) and they used to give 50p free credit everytime. 500MB internet package used to cost 50p as well, so almost every night we used to surf the web, watch YouTube videos and download movies from 3gpmovies.com and watch on 2.4" screen lol. 
The rest are rip offs!