Phones can get signal if your provider has options or tie ups with the in flight network. Any flight of emirates, Etihad or saudia if you have and Middle Easters sim or Asian one it shows 4g network on normal phone. Coz well it’s always been a thing. Charges are outrageous for roaming though.

I wonder if the network provider still makes the final call? Because right now almost all UAE, Saudi and Qatar based airlines offer cell service but it’s your provider who charges your extra inflight roaming. So even if it’s 5g but if I get charged a bomb compared to paying 5 euros for data and network I hardly see a difference..