Use this newish checker page https://www.o2.co.uk/shop/international/using-phone-abroad
Without O2 travel these are the standard roaming rates for Montenegro
*The Game Is On*
Good morning @Anonymous and welcome to our community! Awesome to hear you're going to visit Montenegro! Sounds exciting! Have you been there before?
Check out the info posted above about roaming there and please do let us know if you have any additional questions?
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