on 19-03-2015 14:32
I don't believe O2 keep any records beyond 2 years.
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
on 19-03-2015 17:21
I believe it's 2 years but thought the legal requirement was 6 years but if the OP calls customer service he may get clarification.
on 19-03-2015 22:45
on 19-03-2015 23:30
Some useful information here :
Good find @jonsie I have pinched the link to add to my collection...
Still better to confirm first with customer service that the statements are available....