use Taxify, local Uber clone or anything else, really. But do not use YandexTaxi
Seems to be same amount or more drivers than with Uber in Tallinn.. And well priced too. We were driving in and outside of Tallinn for a couple hours (visiting some suppliers), same driver, waited for us when we made stops. 25 euros on Taxify
I live and work in Tallinn as a remote worker for a few clients; internet is cheap and fast. I've half-Australian / half-Estonian, and have Estonian citizenship so I'm not really familiar with the e-Residency program except to the extent that it's clear the government is investing a lot into it.