I tracked my trip from Helsinki to Paris through my cell phone GPS and surprisingly the batteries lasted enough! (Note: cell phone networks were disabled -flight mode- ensuring a longer battery life… and the full respect of the rules during takeoff and landing
Time, speed, altitude and distance can be clearly seen: liftoff by 215km/h, cruise at 800-900km/h, long approach at 300-400km/h, landing by 240km/h - of course we talk about ground speed here. Cruise altitude (10km) was not kept …

Thank you for this video!