As reliance has license for both GSM & CDMA (in few circles like MP, bihar, WB etc), they can also upgrade to WCDMA & EVDO in GSM & CDMA resp.
But don't know whether govt would allow or not?
Technical point of view EV-DO is superior technology I think relience will either move to EV-DO or directly to HSDPA. This way they can save upgrade to almost outdated WCDMA.
if yes any hacks i need to do with it? 
Reliance What Next (wcdma Or Evdo)
in Reliance Communications
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Technical point of view EV-DO is superior technology I think relience will either move to EV-DO or directly to HSDPA. This way they can save upgrade to almost outdated WCDMA.