With a T-Mobile Pay As You Go SIM, the cost for data is £1 per day, charged only for the days that you use it. Or you can send an SMS to get 5 consecutive days data for £2.50. There's no ongoing commitment, no contract, no monthly minimum. For £20 per month on a rolling monthly contract, T-Mobile offers 600 minutes, unlimited texts and internet access. You can cancel anytime with 30 days notice. If you're a light user, the best deal is Asda Mobile, who resell Vodafone access as a dumb pipe. It costs 4p per text, 8p per minute for voice, and 20p per megabyte for data. No minimum, no bundles, no contract. Regards, Roger