Simple and cheap and severall options. First buy a local SIM card for you mobile, you might need to get the phone unlocked but plenty of phone shops will do that for you. One option is to prefix the UK number with one of the cheap call numbers such as 007, so you use 00744 to reach the UK. Or you can use Jajah but you need internet access to start the call off. Or if you have a good internet connection you can use Skype to call UK phones. Again if you have a good internet connection you can make free calls to other Skype users in the UK. All this applies actually to any country you want to call from anywhere. You can also use MSN but it seems to have gone a bit cranky since the latest version. Also you can get acceptable internet over the cell network with a USB device.