Below are the mobile number series starting with 8100. 8100 mobile series has been awarded to Reliance Mobile GSM Operator for Kolkata Circle. So, all the numbers starting with 8100, including 81000, 81001, 81002, 81003, 81004, 81005, 81006, 81007, 81008 and 81009 belong to Reliance Mobile GSM Kolkata. There are a total of around 10 lac (One million) mobile numbers possible with the series 8100. With each sub-series like 81000, around 1 lac (99,999 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 8100 ( Eight One Zero Zero ).