I've just upgraded the S9 to the S20+, but i still want to use the S9. I have a Tesco sim and was wondering whether this would work in the O2 phone, before I cut the sim down?
Yes it will
@woolly1 Check to see if the sim you're using has perforations. You might be able to just pop the correct sized sim out rather than have to cut it, which could damage the sim.
I DO NOT WORK FOR O2