Microsoft Lumia 650

[JasonCoo_267414]

Microsoft Lumia 650. Unlocked, Smarty SIM recognised, but can't make incoming or out going calls. Is it a known problem that can be fixed, or is it not working because the phone is not compatible with VoLTE use?

I was just trying to set up a user friendly simple mobile for my elderly father 

[MSF]

@JasonCoo_267414 I've just put that into Google and the suggestion is that it is not compatible with VoLTE.

[AlanCha_3432519]

It does not appear in the list of phones that are not compatible

Checking if your device is 4G-VoLTE compatible | SMARTY Help Centre

Have you checked through all the settings in case it needs to be enabled ?