Perform factory reset in your phone to change settings to default also swap sim card to different phone to check in case network settings incorrect as call forwarding, voice mail etc
vhubner replied at 2017-8-7 03:21
Recently I had a couple of missed calls. This is caused by the fact that phone rang only two times a ...
Did you try playing music and activate alarm to test loudspeaker?
If you have some issues please perform factory reset, update phone or use SPFT and flash latest version with firmware upgrade.