GiffGaff does not like you tethering, in fact they can get very upset about it. I think it might be available as an option now but it was the driving reason for me no longer being a customer
Giffgaff says, near the bottom of https://www.giffgaff.com/sim-only-plans#accordion-8:
Can I tether with my plan?
Absolutely. You can tether on all our plans now.
Maybe the PR department updated the web page before the IT department updated the protocols, but tethering should not be the issue. And, as I said, the tethering worked for Safari and Google Maps.
Sorry, I don’t have any ideas here. I’ve only used tethering a couple of tunes for short periods and it seemed to work, but I didn’t extensively test. Does loading iCloud.com in Safari on the iPad work?
Just got back from a two-month trip to the UK and France. We switched to T-mobile because of the advantage over AT&T. Also used the T-mobile deal to get two new phones with a $700 credit (they credit you over two years).
Worked great. A bit slow, but GPS worked.
A warning for the lucky few who can do this: we got a warning at about week 7 that we were going to be cut off by T-Mobile for using data too long in Europe. We missed this in the fine print and it makes sense. The cut off was going to be after we returned. Apparently two or three months max.
ApplePay worked great on London Undergound. Both with pre-authorization or after touching. But pre-authorization worked better—in other words bring up ApplePay and authorized (FaceID in our case) and then touch the contact area on the turnstile. It’s better because sometimes you’d have trouble getting your face in the right place after starting the payment and post-authorization was always slower at the turnstile.
Haven’t opened our mail yet to see if any billing. We did make some calls.