Tesco free sim cards are available for free online and are only available as Pay as you Go with Tesco.
Tesco sim cards come with a range of benefits and offers which includes once each month tripling your top up if you top up £10 you get £30 credit, £15 you get 45 credit or £20 top up gives you £60 credit.
Triple Tesco Clubcard points can also be claimed and also 5,000 free text messages on your first top up (before 26/2/2012).
Tesco Mobile uses the O2 network (Check O2 Free sim cards) which has 99% coverage of the UK meaning you will get decent coverage with your Free Tesco Sim card.
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