14-08-2014 21:30 - edited 14-08-2014 21:35
Same deal on for o2 Payg upgrade.
O2 Pay & Go Upgrade
You can keep your current tariff and you don't need to top up.
Up to 10% of your top-ups back every 3 months
O2 Priority Moments
Exclusive offers and experiences nationwide
Top up £10 - £14 for 50MB data per month or £15+ for 100MB data
on 14-08-2014 21:40
If your upgrading on Payg one is not required to pay the £10 top up in my experience.
It must depend where you buy then as I've always had to buy the top-up