The country code of Armenia is +374. Add 10 + phone number in order to make a call to Yerevan. The list of other city codes in Armenia can be found here. It is possible to make phone calls from almost all hotels in Armenia on your own expense. 

Pre-Paid sim cards are also available at the airport, shops, kiosks and supermarkets.

The pre-paid simcard also hold the possibility to connect to internet. Hotels, restaurants and cafe’s usually provide free wi-fi. There exist also several free wi-fi spots in public in Yerevan.