My US T-Mobile Berry worked just fine in India (BOM,DEL & CCU). It will pick up whatever roaming partner cingular has in india and you should be fine. Note that depneding on your contract with cingular, you will pay roaming gprs data rates everytime your berry tries to connect with the server.

The SIM cards you may buy in india are primarily meant for talking (similar to the cingular go phone prepaid scheme) just sticking it into the berry doesn't mean you can use the same data functions. So if your company is not paying your phone costs, stick to using phones and check your mail using the internet. Wifi and broadband access is quite common in major indian cities.