Thanks for the replies. We do have corporate US account with ATT for our office in the US, who would be purchasing the BB and accounts for us to use at our office in China. We're just looking for the most economical option. ATT seems to be the more expensive option, but as we have a corporate agreement with them, our US office prefers them over tmobile.
Is there any difference in service between the two?
Going for the Chinese BB plan just doesn't seem to be a good option. There are only two plans to choose from, with limited (50M/400M) data/email usage costing just as much as unlimited plans from ATT.
I just don't want to get stuck with huge bills for roaming from ATT if i do choose that option. If i get the ATT plan with voice how could i eliminate the risk of roaming charges? just by not calling? or will they charge me just for having my device on?