Newsagents sell them. So to supermarkets. you call an 0800 number (or equivalent), key in your card number, then the phone number you want and hey presto. You can get calls for a few pence a minute. The higher value of card you get, the better rate you get, usually.
That said, all this is from when we sourced them out for MIL a few years back, but she still seems to be doing it this way.
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The most difficult thing is the decision to act, the rest is merely tenacity Amelia Earhart
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