For those traveling to the Ice hockey championships using the visa free entry to Belarus:
Getting a prepaid SIM card is easy and not expensive. I bought my in a telecommunications shop of a small shopping center (russian связьб "svyaz" = communications).
The SIM card of
MTS network I chose costs 10,000 BYR (Belarus Roubles, see
Yahoo currency converter) including 10,000 BYR. It is easy to top up by internet, though I did not find the registration button on the English version of mts.by. I booked 1 GByte internet traffic for USD 5.
The championships special offer of
Velcom network is cheaper: For
30,000 BYR (USD 3) you get the SIM card and 1 GByte internet traffic.
Callback works but only after my complain to my provider.
Credit card acceptance is excellent allover Belarus. SIM card options may be managed by USSD codes in both networks. There is phone support in English language too (free of charge).