There are no area codes in Estonia; if you’re calling anywhere within the country, just dial the number as it’s listed. All landline phone numbers have seven digits; mobile (cell) numbers have seven or eight digits and begin with 5. Estonia’s country code is 372. To make a collect call dial 16116, followed by the desired number. To make an international call, dial 00 before the country code.
Almost all of Estonia is covered with digital mobile-phone networks, and every man and his dog has a mobile. To avoid the high roaming charges, you can get a starter kit (around €5), which will give you an Estonian number, a SIM card and around €5 of talk time (incoming calls are free with most providers). You can buy scratch-off cards for more minutes as you need them. SIM cards and starter kits are available from post offices, supermarkets and kiosks.
Public telephones accept chip cards, available at post offices, hotels and most kiosks. For placing calls outside Estonia, an international telephone card with a pin, available at many kiosks and supermarkets, is better value. Note that these cards can only be used from landlines, not mobile phones.