The passport is activated as soon as you either use 10mb of mobile data, send a text message or make a phone call.
As you have set a spending limit it needs to cover you stay.
Moninegro is a rest of the world country so you will see a significant charge for using your phone here as you are charged per MB (and not GB) at £2.16 per minute for calls to UK landlines and mobiles. Receiving a call will cost you £1.80 per minute.
You can use your phone as a hotspot.
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