Below are the mobile number series starting with 8100120. 8100120 mobile series has been awarded to Reliance Mobile GSM Operator for Kolkata Circle. So, all the numbers starting with 8100120, including 81001200, 81001201, 81001202, 81001203, 81001204, 81001205, 81001206, 81001207, 81001208 and 81001209 belong to Reliance Mobile GSM Kolkata. There are a total of around 1 Thousand (One Thousand) mobile numbers possible with the series 8100120. With each sub-series like 81001200, around One Hundred (99 to be precise) mobile numbers are possible.

You can click on any of the number series below to view the sub-series / list of numbers under them, starting with 8100120 ( Eight One Zero Zero One Two Zero ).