How can I block calls/texts while using internet [Lumia 820, WP8.1]?

[Windows Central Question]

Hi, while I use cellular data (i.e., internet) and while using skype... I dont like get gsm calls or sms...before their was a feature called "call barring" now its disalpeared...how can I do that on my LUMIA 820 (windows 8.1 lumia cyan)

 

[Chris_Germany]

Turn on Flight mode -> turn on WiFi