Today I missed several calls because they went straight to voicemail. I couldn't find out why this was, but restarting fixed the problem. I've been trying to see how to set - and unset- call forwarding. I look under Phone, Settings, More settings, which is where I'm told the forwarding options should be but they are not there. It may be relevant that the phone was bought in the US on the xfinity network.
I'd appreciate any help.
@aitchgee If restarting fixed it you don’t need to worry about your settings, they will be ok. If you phone has carrier customised firmware it may not even be possible to change any of the settings anyway.
It sounds like your phone dropped off the network and the reboot reregistered you.