As one of the unfortunate customers to experience last weeks network disruption from O2 they have mentioned on their blog:
We have now identified all those customers directly affected (those whose devices could not connect on our system) and we and are giving them the equivalent of three days back for the disruption as a gesture of goodwill and to say sorry.
Pay Monthly customers will receive 10% off their July subscription which will be applied on their September bill, which is equivalent to 3 days back
Pay & Go customers will receive 10% extra on their first top-up in September
(These will be applied automatically - you don't need to do anything to activate them)
To thank all our customers for supporting us through an unprecedented and difficult period, we are also giving everyone on O2 a £10 O2 voucher to spend in store. This will be redeemable via the O2 Priority Moments app or online at www.o2.co.uk/priority. It will be available between 1st and 30th September to download through Priority Moments and use in store, with no minimum spend. (One voucher can be used per transaction and no change given.)
Cannot be used on Pay & Go top up or for bill credit on Pay Monthly.
Can be used to take money off phone purchase, excluding iPhone and BlackBerry.