(India Only)With rapid growth in mobile number subscribers in India and low call rates, most of calls we receive on our mobile are form other mobiles only. At the same time, to cater increasing userbase most operators come up with new series everyday which makes remembering a cell number increasingly hard. Also sometime we just want to trace a mobile number for reasons like unknown number in miss call list, to get hint of callers permanent location (sounds unlikely, I know…), etc.
But if you have a look at this wiki page, you can certainly trace any mobile number upto the level of its mobile operator and state (or zone) that’s too using first 4-digit only. It (wiki page) lists all mobile number series in nice tabular manner categorizing them according to mobile operator and state (or zone).
Like other wiki pages, this wiki also updated regularly and provide you almost latest information. I never got disappointed by it. I am using it from around a year.
If you prefer simpler interface where you can just enter your cell number and get the desired information, you can try this and this websites.