Hi Norman. Since the Solo app is downloaded into your ios or android device, you shouldn't need your cell phone service to fly. I have flown many times with no cell service available and had no problems. Just make sure all of the firmware is up to date on your app, Solo and controller, as well as your GoPro. Also make sure you are aware of the local regulations on flying your Solo in each country your are wanting to fly in. I wish you luck, and safe flying.
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