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I used to live in Sutton coldfield near some high rise flats.
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Used to get this issue as well, sometimes it would work other times it was impossible to get in.
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The cause was a mobile phone mast on top of the flats.
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It only affected certain frequencies which included car alarm fobs
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Eventually it got so bad that we had an inpsector out who measuered the microwave signal in the street and it was way over the legal level.
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T-mobile
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If your struggling to make your fob heard, have a look around.
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