Should you happen to run out of data during any month you can purchase what are called O2 Data Snacks in units of 1GB or 2GB (maximum 6GB in any one month).
To do this please simply log in to your account and go to My eSIM where you can purchase 1GB for £8 or 2GB for £12. These will be immediately added to your account after Checkout.
You can email us to upgrade your plan at any time to give you more data on a regular basis. However please note that any upgrade will not take affect until the 1st of the next month. So you may need some data snacks to tide you over to the end of the calendar month.