@ConSider I have been using the Brax3 with Tello since August 25th. Voice calls were fine but initially I could not get mobile data. I was able to resolve that issue by following these two steps (your mileage may vary but these have worked for two other users that I know of, namely @wardee and @handsolo ):
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I performed a factory reset (search for factory reset in settings). At least in my case, this operation preserved the Tello eSIM configuration
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I set the APN during Iode setup phase with these settings that user wardee posted in another thread (Don’t set your wifi during this phase. You can do that later. Under mobile data you can find the APN menu. Click on the “+” button to add your APN) :
You can find the APN settings posted by @wardee here: