Forward all calls to voicemail

[Chris+in+Ashtead]

I'm sure there must be an easy answer to this, but I can't find it anywhere.

I'm travelling overseas and would like to have all incoming calls to my Sky mobile number forwarded immediately to voicemail without ringing. I know I could simply remove the SIM, but I still want to receive incoming SMS messages.

Is there a voicemail number I need to forward the phone to?

[caesarome]

@Chris+in+Ashtead 

If it is possible it might be shown here:

https://www.sky.com/help/articles/sky-mobile-voicemail