In my last 5 days visit to London, I’ve been recommended to use this local mobile line from a company called Lebara. The charges are extremely unbelievable, and it gives you more freedom to use the mobile in calling internationally at very much cheap rates. The SIM card itself is free of charge to start with, and if you top-up with 20 pounds, you get 10 extra. So, I’ve been making a lot of calls to Kuwait, with that, I ended up reaching Kuwait with around 7 or 8 pounds remaining in balance, so imagine how much you will have to talk in order to spend the entire 30 pounds. On top, and to make it even more attractive, the local calls in UK from Lebara-to-Lebara lines are totally free of charge!