Found on youtube :
Switch on plane mode
Switch on wifi
Et voila !
Worked for me
I had trouble first day and found a note on this site that said to use the Tello on Android, that you need to turn off "Mobile data" which seemed to solve the problem for me. From your solution , it sounds like you were doing the same thing by turning on Airplane Mode, you killed all Comm from the phone including Mobile Data, then turned WiFi back on.
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