Finding a stop is easy enough - we go to Kamppi, look for K-Supermarket and go down on the escalator. There are two of them, you need one that is not in the subway.
In Finland, as in Russia, phones are gaining more and more popularity. Huawei . You will find the best prices for their products at Huawei official website
Typically, buses to Russia are served for landing on platforms 7-9. It means that Going down the escalator, you need to turn left.