UK:
Tesco Mobile
Another very good option is Tesco Mobile.
Available at all Tesco Stores, Tesco Mobile is a MNVO using the O2 UK Network.
Unlimited Browsing is £2 per Week (Starting Monday)
Calls are 20p / Minute; 10p / Text.
Tesco currently runs a "
Triple Credit" promotion which adds 200% of your top-up free of charge (valid for one month).