on 30-01-2021 17:19
on 30-01-2021 17:20
Login to your MyO2 http://www.o2.co.uk/myo2 and go to change tariff.
on 30-01-2021 17:23
on 30-01-2021 17:26
on 30-01-2021 17:26
You must have used some credit then @Artiom
You can also check your balance in your MyO2.