Hi @Drumchapel, are you after O2's address or having issues with a delivery? There's some advice above but if you tell us a bit more about your situation we might be able to help out further
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If you mean your address, it may be that it's not on the post office database, so you'll need to call customer services to get it added http://www.o2.co.uk/contactus
Or do you mean your family moved without telling you.....
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