I think Vodafone have a network arrangement. Make sure that the mobile that you use is a tri-band, and as the 1900MHz frequency.A tri-band should also have the additional 900MHz and 1800MHz frequencies.
Word of warning, Mexico as a high rate of muggings in certain areas, so be very carefull about using and displaying any mobiles or similar value items.Would also suggest that you think about obtaining a mobile in Mexico, if you intend to use it a fair amount. Connecting via a UK contract can at times work out very expensive.
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