New tariff

[Miick]

If i upgrade my tariff to get more data will i be able to use it straight away

[pgn]

If you are on O2 Refresh tariff: you can change tariffs 30 days after you receive your new phone. You’ll be able to move between the other tariffs that were available on your phone when you bought it, subject to an annual RPI adjustment. Simply sign in to My O2, and choose the tariff you want to move to.

Your new tariff will start from the day of your next billing date.

Sounds like you need a one-off data Bolt-On, @Miick - https://www.o2.co.uk/shop/all-tariffs/bolt-ons

Good luck.

[MI5]

@Miick 

Take note of the difference:

Upgrades are active within 24 hours, tariff changes take effect at your next billing date.