I'm on Vodafone prepay and for the last few years I've had Vodafone offer me add-ons that it calls "NZMBs". The offer is usually worded something like "Need more data? Reply YES to get 300MB of NZMBs for $0.50, lasts for 7 days".

I've always ignored these because I've thought that "NZMBs" meant it would only apply to traffic that terminated in NZ (eg NZ hosted websites, etc). I remember years ago, before we had unlimited broadband, some ISPs would give you unlimited traffic to NZ hosted sites and they wouldn't count that traffic towards your monthly GB limit; I thought that Vodafones "NZMBs" deals were like this. I play a few mobile games, such as Pokemon Go, and sometimes the extra data would be handy if it's near the end of the month and I'm running low, but I thought the data wouldn't apply to my games since they'll be using overseas servers.

Last week I received another one of these offers, but this time it said "Need more data? Of course you do! Reply YES to get 310MB of data for only $0.75! Offer ends Thursday and lasts 7 days. Call 321 for info." Since no mention was made of "NZMBs" I thought "Great! I can use this data for playing my games!" and so bought the offer. I got a reply back saying "Great, you've now got NZMBs to use in NZ anytime". "Oh no!" I thought, "It is NZMBs after all!" Then I read it a bit closer and saw the bit that says "to use in NZ anytime". "Ah!" I thought, "Maybe 'NZMBs' doesn't refer to traffic that terminates in NZ like I've always thought, maybe it just means the data must be used in NZ as opposed to being used while roaming overseas".

Am I correct in my assumption? Have I been wrong all these years?