Signing a monthly contract with a service provider is easy. The most convenient way is to step into a Telia, Elisa, or Tele2 store and take it from there.
Before you get set up with a contract, you can buy prepaid SIM cards at any Telia, Elisa or Tele2 store or from supermarkets, R-kiosks, gas stations, and post offices. Their prices are equally low and most of them include free minutes, texts, and some data.