Can i unlock Huawei y300?

Welcome to Android Central! Are you asking about carrier unlocking, or bypassing a lockscreen password?
 
Is the phone carrier-branded? In other words, was it originally bought directly from a wireless carrier? In that case, it would depend on that carrier's unlock policy.

You would also need to see if the phone supports your carrier's network bands. Which carrier are you trying to use?
 
I can't find a detailed T-Mobile Montenegro unlock policy here in the US, so you should probably just contact T-Mobile there and ask them.

From what I can tell, if the phone is unlocked, it should support M:Tel's 2G and 3G networks. It doesn't look like M:Tel has 4G, though, unless that changed recently.
 

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