For me at minimum 5 more 
I think sometimes that the producers of phones like Purism or Pine underestimate the importance of making reliable!!! calls. They often say us that we have a mini computer in our pocket for all the places we go.
But phone calls are at least for me the absolute base for all I do with a smartphone. Without reliable calls I do not need a smartphone - regardless who is the producer or programmer.
Just my 5 cents
Uwe