I will be flying from America to Japan, then the Philippines next week. Will my I-phone 8 work out over the Pacific Ocean? Or just turn it off to save roaming charges?
Most air carriers prohibit the use of cell-based communications while in flight. A few carriers provide cell connectivity.
Many aircraft, however, contain wi-fi routers, which allow wi-fi connectivity while the airplane is in the air. Passengers usually must pay for this connection, although connections to the airline's own web page (perhaps including some entertainment streaming) may be provided without charge.
Certain types of communication, such a voice calls of any type, are still prohibited by almost all carriers.
Source: a lot of flying.