how to block certain country incoming calls

[BinAdam]

I received missed calls from unknow number with code +68830 following different number everytime.

Kindly advise how can I block all the incoming calls with this country code?

It is annoying to me.

[bb91_SA71]

You can block numbers specifically by using the following steps.
Phone > Settings > Block Numbers > on 'Add phone number' field type the number you want to add & click '+' button to save

[BinAdam]

I want to block whole country code because I received calls from different numbers each time

[MohammedSijah]

I think there is no inbuilt facility for such an option. You can block all unknown numbers. That's all. Else go for any third party apps.