Yeah giffgaff runs on o2. I should have mentioned before that I bought the new phone because I broke my old one. The old one had a full signal all the time so it's not a problem with my location. I've tried locking to o2 but it still drops.
I've had the same issue with a giffgaff SIM, but with an HTC One. Something to do with how certain phones deal with network switching power-saving stuff I recall? Didn't happen with Three and never did fix it, just dropped giffgaff
Yeah giffgaff runs on o2. I should have mentioned before that I bought the new phone because I broke my old one. The old one had a full signal all the time so it's not a problem with my location. I've tried locking to o2 but it still drops.