Rafael:

If you have TELMEX's prodigy infinitum at your home or office in Mexico, check out their web page, on the "prodigy movil" section.

They do have a "temporary" promotion where you can ROAM on international sites where AT&T and Boingo wireless services is provided.

So, you may be able to use your same prodigy account in China as well. I have used mine in many countries. works great and no more expenses besides what you already paid in Mexico in your montly bill.

Saludos desde Mexico DF.

febb