MOBILES

There are two ways in uk for using mobile

1. "Pay as you go" this means like pre paied cards in pakistan
2. Contarct where you buy mobiles from the company who sells you your desired mobile on a contract of one year or two year with min cradit (of 10 or 20 pound or so on) per month. can say something like post paid system in Pakistan

There are alot of mobile services in pakistan which are being used. big question is which mobile service to use.
You can order which ever service you like online they will drop free sim at your door step.
here I will disscuss 2 services

3-G sim and
LEBARA sim

Buy 3-G sim
and mobil with window configuration
to install skype (you need to have a skype account)
and you can use free skype in uk or in pakistan plus msn is also free with 3-G sim utility.
http://www.three.co.uk/Home

Lebara sim is one of the service used alot to call Pakistan. 9p per min and 10P message in or out of UK
http://www.lebara-mobile.co.uk/en/

But you can always compare the plans and services
http://www.compareplans.co.uk/