iPhone 5

[Anonymous]

Constantly no signal and keeps cutting out in the middle off calls , called O2 many many times , exchanged phone twice , went in my local O2 store , they told me today it's not an O2 problem it's an apple problem , who do u believe I give up now .

[MI5]

Check for any network issues in the postcodes you use here http://status.o2.co.uk/
Have you had your sim card exchanged to rule that out?
What reason do they give for it been an issue with Apple?
Have you tried a rest of the phone?

[Anonymous]

You could get it checked out at an apple store free if under 12 months old.

http://concierge.apple.com/reservation/gb/en/techsupport/