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Oh right, cheers dude...I've just been checking with Vodafone...I don't need to do anything if I'm going abroad.
To make this more complicated...you have to dial 044 to specify it's a mobile...but only within mexico city...if you are dialing from another state in mexico, then you don't have to! Surely that is the wrong way round? Also, her number starts with a 2! Not a 0...only a 0 if you are dialing it within the same state. Wow this is confusing...I've given your method a bash so I will have to wait and see.