In the USA the LG Spectrum was made for Verizon ( maybe in India Verizon has a similar counterpart ) designed to be used with a sim card 4g LTE on Ruim / sim mode. I flashed it to Verizon prepaid pay as you go plan , and had to use Stock Icecream Rom to access programming ; then I flashed same Rom as you : Cyanogenmod 10.1.3 ( best stable Jellybean Rom ) and dialed *228 ( code to OTA programming in USA ) and just let it do the programming automatically, press on speaker and heard asking for choices 1 to activate or 2 to do a PRL . I did nothing and it picked choice # 1 ( activate ) after 2/3 minutes it said activation successful ( it was true , phone had a new phone # and a new PRL ) was able to do talk , txt and data 1Xrtt (156 kbps). I'm not sure but maybe if you replicate steps it might work also in India .