Not A Speck Of Cereal
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I don't think that is correct. RTH will work, but if you don't have GPS on the control device you can not reset it.
As for sim card I can't see why that would matter.
That's my understanding. By "can not reset it", that means "cannot change the home point that was already recorded by the aircraft when you took off".
So RTH will always have the original home point to fly home too, even with a tablet / device that is not even cellular capable.
Just don't take off until a home point is recorded (the controller will tell you when that happens), but then, that's always the correct thing to do, regardless of cellular capability.
Chris