Will old SIM card work in new smart phone?
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My mum is looking to buy a new smartphone but wants to keep her old SIM card. The SIM card is around 12 years old and so is the brick of a mobile phone that was bought with it. She is with Tesco PAYG and wishes to stay with them. I told her that the sim should work in whichever unlocked smart phone she chooses (she only wants a cheap one). But I am doubting myself that I have told her correct information. Will the old SIM card work with a new smart phone?
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12 years old almost certainly wrong size . Ask TESCO PAYG for new size sim to fit the new phone .
As for the suggestion about cutting the SIM, you cannot cut a mini/micro SIM down to nano easily, because there is a minor difference in the thickness.
PAYG can be expensive if you use more than very small amounts of data, the Giffgaff people are worth a look. They offer a kind of PAYG where you top up using monthly “goodybags” without a contract. Unlimited mins, texts and a good chunk of data for a similar cost to a long term (12 or 24 month) contract on a basis where you can chop/change any time. Without a “goodybag” the rate is 25p/min to make a call.
Lebara is another option (I have several older relatives on them, including my mum who is a 'silver non-surfer' whom I got a smart phone primarily for internet banking). They give 50 to unlimited calls to 41 countries.
Where they are Vodafone based (personally much better, generally seem to be regarded as better), the OP may prefer Lyca who are similar but o2 based - I'm not familiar with them, but believe that they do 100GB for £12 which is excellent for a heavy data pay and go user.