Without knowing what phone, which account type and where you are, it's gonna be difficult to guess.
Make sure data roaming is enabled and if on contract, your apn should be "mobile.o2.co.uk"
Also try manually searching for different networks and try them, even if they say forbidden.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
Please select the post that helped you best and mark as the solution. This helps other members in resolving their issues faster. Thank you.
