check this one, a Verizon XV6700. One of the best devices supporting WiFi, EVDO. Best part is Verizon does not lock it (unlock code is available on the web, some 9 zeroes or something), so if Reliance is on the same bandwidth (1900Mhz & 800Mhz).. this can be brought to India. It is also compact compared to typical Windows PDA's.
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http://www.mobiletechreview.com/Verizon-XV6700.htm