BSNL supplies ZTE AC8700 modem for EVDO users. The model is ZTE MG 478.

Information from product page:

Specification:
Frequency: 800MHz
Dimension: 80mm × 36mm × 12.8mm
Interface: USB
O/S: Windows 2000/XP/VISTA

Feature: Voice call Dialer,Phonebook,SMS Manager,Call history Compliant with CDMA2000

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Microsoft has released a patch for Vista that improves EVDO Wireless Data Card performance when running under Vista. This patch is NOT available as part of the Vista sofware update, you will need to download the patch directly from Microsoft.

Symtoms (from 940646)

You use a 3G wireless wide area network (WWAN) data card on a Windows Vista-based computer. The WWAN data card uses a connection that only

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