A friend of mine created a spreadsheet to calculate how much it would cost him to change to a new mobile phone provider. The result scared him to death. According to his spreadsheet, based on his expected usage (he’s a low user) it was going to cost him almost £500 per month!

When I examined the spreadsheet I found that adding 4 brackets to the formula was all that was needed to generate a more accurate and realistic figure of £18

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