Can I use my mobile data on a plane?

You cannot use your cellular mobile data while the plane is in the air, as it requires a connection to ground-based towers. You must put your phone in airplane mode. However, many long-haul flights now offer paid in-flight Wi-Fi, which allows you to use messaging apps and browse the internet. Your cellular data, like from an eSIM, will work perfectly once the plane has landed and you can disable airplane mode.