I moved to O2 yesterday from Vodafone. I used to have a 15GB data limit and never used more than 3GB in a month.
Having activated my new O2 SIM around 9pm, and making no changes to the settings on my iPhone, I was surprised to see that I’ve used 2.4GB in 24 hours. I’m on Wi-fi at home and have done nothing differently.
This is seemingly not a one-off, as Google has thrown up a number of others on this forum with the same issue.
What’s going on? I don’t want a response “turn off mobile data” or similar as I shouldn’t need to make any changes. Why am I so data hungry all of a sudden? The only change - literally the only thing - is moving from Vodafone to O2.
I had the same issue on one of my accounts a few years ago.
O2 were not interested nor did they offer anything to help or investigate.
I actually moved that account to Vodafone and have not had any problems since, so my advice would be to go back within your 14 days, whilst you can.
I've no link to O2 other than being a customer.
The account I moved was the one I pay for my daughter.