There isn't a 'Data' plan. It is just international roaming for the TP 2.
http://www1.sprintpcs.com/explore/co...=30&submit.y=9
Blackberry has a plan because of RIM and their network.
In Mexico you do not need any additional features, but other than Mexico and Canada you do need to have International features on your phone.
Otherwise for Data it is .002 per kb