Vasa kartica je validna do

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Hello. I was inMontenegro at autumn. Now I put my m:tel sim card in my phone. I pressed *100# and recieved message that I got 5 euro on my account and it expire at 03.03.2015 (i attached screenshoot)


Now I am in Russia, but I planing trip to Montenegro again at summer. What can I do to use simcard in Montenegro again?