Why don't mobile phones work in supermarkets?

Agent Triple P was in his local supermarket today and tried to phone someone but, as usual couldn't get a signal without walking all the way to the doorway.  There's nothing more frustrating than phoning someone up to, for example, ask what they want for dinner and as soon as you approach the shelves again your signal dies so you have to go back to the doorway.  It's not just the local branch of Tesco's either but all the other supermarkets in the area.  Perhaps it's because they are very large buildings but we go into other large buildings, airport terminals, department stores and such and don't find this problem.

Are the supermarkets deliberately blanking out phone signals so you can't do price comparisons or is it to foil rival stores; mystery shoppers?  

It's all very odd and annoying!
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