What? My wifi barely reaches the other side of my room with a wall in between, how am I supposed to think 350 miles is within reason? Even with clear sky, your signal to a tower an order of magnitude closer would be unusable.
If you look at apple’s latest feature, even them, with specific hardware probably, requires minutes of open-sky pointing directly at the closest satellite, to transmit mere bytes of data.
That tells me that if your phone is just hanging in your pocket, indoors, with a 5G nearby, it’s not going to reach the satellite at in any shape or form.