Data & Calls issue

[JohnBra_1853536]

Over the last few days I appear to have an issue with accessing my data and making/receiving phone calls - anyone experienced this?. 

[MSF]

@JohnBra_1853536 Not really enough info here.

Is it maybe to do with 3G turn off? Is your phone on the compatible list?  https://help.smarty.co.uk/en/articles/8985136-checking-if-your-device-is-4g-volte-compatible