The number of satellites is not relevant. It's a single parameter a large number of them which describe how well the constellation will perform. Please see here

The number of satellites is not relevant. It's a single parameter a large number of them which describe how well the constellation will perform. Please see here for more detail: https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.mit.edu/~portillo/files/Comparison-LEO-IAC-2018-slides.pdf&ved=2ahUKEwi00Kjv0_bhAhXNu54KHcnuA6sQFjAAegQIAhAB&usg=AOvVaw07haQ4In4XKLe0tB0IiviQ&cshid=1556587401142 https://www.google.com/url?sa=t&source=web&rct=j&url=http://... The satellites are not the hard part, even though they are extremely hard. The hard part is going to be getting a suitable user antenna for a low enough cost that they will make the money back. So far they have not spoken publicly about their user terminal or cost, other than a couple sound bites musk said years ago about how low he wants the cost.