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Phone activated today by my son at Delhi. Reliance CDMA working PERFECTLY. Rest detailed report and photos on Monday. Mine is a UP (W) sim and working out of the box even while roaming in Delhi. No special settings done or needed.

You need a OMH Diamond sim only (with diamond symbol) and its RSN no. which is printed on the sim should start with RECRUC (ideally RECRUC06) series. That is supposedly working out of the box with this phone. My phone has arrived and is presently in Delhi. I should get it on Sunday whereby I will give a proper detailed report. But as per all reports you should not worry and this is the most ideal (CDMA or GSM) phone right now in India in the sub 10k range.

Hey @mitJ@in , Yes. You are right. They cant work on both technologies. If you some handset manufacturer supprts CDMA then he has to pay royalties to Qualcomm, in GSM it is not so. 4G is evolution from 2G-HSPA, the evolution of CDMA was UMB (Ultra Mobile Band, developed in 2006) but Qualcomm dropped it in favor of 4G in 2008. What we call 3G is actually CDMA technology (if you look at the phones supporting 3G, you will notice the manual/box will say W-CDMA). 4G or LTE is an evolution from both CDMA and GSM but I don't think there will ever be a unified SIM suporting both CDMA and GSM available for public, the technologies are very different. CDMA is dying in India, sad but true. https://en.wikipedia.org/wiki/Removable_User_Identity_Module