I have not been able to register my BSNL SIM on a 3G network ever in this handset. (I have tried a custom cut 3G BSNL SIM which also failed to register the 3G network). Initially, there were frequent total network loss. I mended it by instaling the Network app from the Play store which allowed me to set the reception mode to "GSM only". The problem recurrs if I try to set the reception mode to "WCDMA only" or "WCDMA preferred".
Interestingly, the same SIM (and all other BSNL SIM including 2G and 3G) registers the 3G network on my Nokia 5800 and also my 3G internet dongle (Huawei 1550E).
Has anybody else also faced the same problem? If yes, can it be overcome by the Xolo updates?
(BTW, I updated initially with the 27 MB update and not thereafter due to the fear of not being able to root my device ever, if required. The update had no effect on the network reception.)
Can the learned men in this forum throw some light on what can be the reason for such a behaviour by my Xolo X900?