From a few hours now my FP2 (1 month of usage) says Call Not Sent when I try to call.
It does’nt happen allways, in my experience I happens 95% of the times, as I tryed to make calls during the lasts 4 hours, about 30 times, and it went fine 2 times.
This is what I tryed, the result was unsuccessful (Call Not Sent) No matter if …
… destination number is domestic (+34) or international.
… I chose the domestic SIM (2nd) or the international SIM (1rst)
… I write the number with or without the country code
… I write te number or I pick it up from the Recent list, or from the contacts List.
… I enter and then exit Flyght Mode, If turn it off and then turn it on,
… I make a Hardware Reset (switching off, leaving the battery for 10 s)
… I turn off one SIM or the other
… Language Settings is set to Spanish, to English, or to Catalan
… Set preferences to 2G or 3G or 4G for each SIM (Only one SIM could be 3G)
Finaly, after a Hardware Reboot (removing the super-easy-to-remove cover), it showed me a message; com.android.phone stopped.
I’ve had call not sent issues on other phones that were linked to issues at the provider (network errors or busy networks). Usually this was resolved by the next day. Another possibility is a poor contact between the SIM slot and the SIM (but usually you’d also see the network reception icon behave weirdly) - removing and the re-inserting the SIM could help.