Check EVDO speeds at your home otherwise it will be a futile exercise . Either BSNL demo or friends DATACARD
Its as simple as going to BSNL office and buying a new BSNL CDMA RUIM . Their are 2 types of RUIM available . 40 bucks CDMA and 250/300 bucks EVDO RUIM .
Lets call 40 bucks RUIM as CDMA sim
and
250/300 bucks EVDO enabled RUIM as EVDO sim
Somebody did comment that he got EVDO on CDMA sim but i could never get it . My EVDO top up never goes through on CDMA sim . So i bought EVDO SIM
All voice and SMS work fine on both RUIMS . Data also works fine on both except I couldn't get EVDO on CDMA ruim
Dont buy BSNL branded datacards . Buy unlocked ZTE AC2766 from ebay and pop in the RUIM and you are online . Same RUIM also works in all OMH/RUIM enabled Sprint/verizon/ others handsets
This is CDMA RUIM prepaid page
http://www.bsnl.co.in/opencms/bsnl/BSNL/services/mobile/cdma_prepaid_tariff.html . Its given EVDO enabled on this page itself
STV
http://www.bsnl.co.in/opencms/bsnl/BSNL/services/mobile/special_tariff_voucher.html
EVDO RUIM prepaid
http://www.bsnl.co.in/opencms/bsnl/BSNL/services/mobile/evdo_prepaid.html
postpaid
http://www.bsnl.co.in/opencms/bsnl/BSNL/services/mobile/evdo_postpaid.html
I have postpaid EVDO . DATA roaming works all over india . Wherever you go you will surely find 1x signal to fall back to voice and data . 1x is exaclty like a GSM 2G speeds
@cisco_tech is testing BSNL 1x speeds on his Moto G . You can ask him his experience on voice quality and data speeds
EVDO speeds are directly related to distance of BTS and number of users . I get 250/280Kbps download speeds in night