Not a problem. First create "+" symbol for access to long-distance call - this is usually made by press/hold "*" button. Then dial 7 (not 8!!!!!) 903 (or whatisthere - it's the local code of mobile operator) and 7 digits of the number - like +79031234567.
Beware about cost of roaming!!!! could surprise you a lot (once had been up to 5 EUR/minute, now should be less, but I'm not sure how much). Buying a local SIM-card could be useful - local calls via mobile in Russia are rather cheap, ab. USD 0,10 - 0,15/minute.
Beware about cost of roaming!!!! could surprise you a lot (once had been up to 5 EUR/minute, now should be less, but I'm not sure how much). Buying a local SIM-card could be useful - local calls via mobile in Russia are rather cheap, ab. USD 0,10 - 0,15/minute.