O2's announced compensation is:

* Two days of an airtime contract (so e.g. if you just pay them £30 per month, that's about £2 in value for you)

* 10% discount on two types of pay-as-you-go payments with no specific limit but expect one to be announced.

The latter in particular you can expect to be heavily abused, because O2 needs the PR. I'd be astonished if that limit is any lower than £100, meaning they're giving away a £10 value.

I have a feeling you need to call and waste a lot of time, so most people won't bother... They won't lose near that much in real life.

No. O2 pay-monthly customers got a text message from them saying the credit will be automatically applied.

For what it's worth, I'm on a 20GB/month mobile data plan with O2 and pay £30/month.

Puts into perspective how many customers don't change their plans when they're able to...

Have you tried calling them up and asking for a better deal? I’m paying £16 a month for 40gb with BT, so surely o2 could give a better deal!