Cannot hear outgoing or incoming calls (not onnecting). Have volume high, do not disturb off etc.

Hi PennieGi_124578 
What phone make/model do you have?
Is it compatible with SMARTY VoLTE network?
https://help.smarty.co.uk/en/articles/8985136-checking-if-your-device-is-4g-volte-compatible
Hopefully this info will help someone point you in the right direction.

Hey PennieGi_124578,

There are a few reasons that this may be happening, I recommend that you speak to our customer care team who can offer account specific advice https://smarty.co.uk/contact  available daily from 8am – 8pm.