I have not bothered earlier but now I got myself a Russian mobile number. It makes more sense to be available via a Russian operator for the next two weeks and for upcoming trips to Russia so I have signed up with the same operator as Tanya, MTS. MTS is also the only operator with coverage at the dacha, kind of comparable to Telia in Sweden it seems like. And it is of course better to call Tanya and other MTS users for free compared to being on roaming with Swiss and Swedish operators in Russia. Since I stick to my Android-and-iPhone concept I have temporarily kicked out the Swiss SIM card.
One funny thing about mobile phones in Russia, at least with MTS, is that you do “roaming” with different rates also within the country when you leave you “home region”. In my case I am registered in the Kuzbass region and one can see from the prefix that I have a Siberian number.
So, my new Russian number is: +79832230631