Internet providers
Generally, tenants already have a contract with some internet provider. If you are staying in one of the student dorms, you wil have access to EDUROAM and CAMPUSWIFI, so Internet connection at your flat or room should not be a problem. However, if you happen to need this service from any other provider, here are some of the main companies that offer internet connection:
STV (The webpage is only in Estonian and Russian, so you might need to ask your tutor or some friend to translate).