iPhone Data Disabling help!

[Lead_Head]

Hello all,

I'm going on holiday to Mexico on Thursday and I need to disable any data usage so I don't get charged an extortionate amount of money on my contract for roaming.

How can I ensure that I do this successfully?

Cheers...

 

[Lead_Head]

It is jailbroken, and I'm sure I installed bossprefs, in order to put customize on it? What's the latest version?