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That site compares ONLY SEVEN providers.

A quick check on the cost of calls to Spain shows their cheapest recommendation is 3p/minute.   That's 3 times more than the 1p/minute I pay (via 1899) and 3 times more than is available from at least 3 other providers which telecompare.co.uk don't mention.

Similarly, their cheapest recommendations for calls to USA are 3p or 4p/minute.   That's 6 or 8 times more than the ½p/minute I pay (via 1899) and 3 or 4 times more than is available from at least 3 other providers which telecompare.co.uk don't mention.

Try niftylist instead - that shows ELEVEN providers.