Re: What frequencies?
It doesn't matter how free they keep it the FCC does not allow transmitting any of these bands from space nor do any other radio management agencies around the world. So any hope they have of this working is a decade or more away.
Then there is the whole problem of distance. Anyone here notice when they are more than ~20km from a tower their phone says no service yea that satellite is over 1000km away. Yes they will come in closer but at 500km that thing is moving too fast to keep a signal to a phone.
Yes mobiles can go more than 20km but they tend to not allow it due to the whole problem of TDM, most 5G transmissions are going to be cut far shorter than that. At the distance, they are I wouldn't be surprised if when someone was on a call it knocked cell service out for everyone within 3000 km.
TLDR radio management is hard very hard. Anyone who works in radio knows Apple went the way they did for assurance of a service existing 5 years from now and tech that actually works.
As for Starlink it has many battles to remain as is never mind deliver new things.