I think you missed the point. So you get to the front of the queue, have your temperature checked, told to scan the QR code, and then pause/stop everything, you don't know how to turn on the roaming facility on your smartphone. Of course, as soon as I read CO-CO's USSD ( Unstructured Supplementary Service Data) I had forgotten immediately the code number *777*35# provided. It's not a number that will stick in my mind either as I never use USSD's for anything else. Fast forward, I am now well and truly stuck at the front of the queue, trying very hard to remember what the USSD was to get a roaming facility. Tempers behind me are beginning to flare a little as time passes. For fark sake, hurry up please. 555! I know what it feels like, I have been stuck at the check out for 5 or 10 minutes, or longer, waiting for just one person in front of me to remember how to use his smartphone to scan the QR code to pay his farking bill. Maybe they didn't have a roaming facility either.