Below are the mobile number series starting with 91721. 91721 mobile series has been awarded to telenor Operator for Mumbai Circle. So, all the numbers starting with 91721, including 917210, 917211, 917212, 917213, 917214, 917215, 917216, 917217, 917218 and 917219 belong to telenor Mumbai. There are a total of around 1 lac (One Hundred Thousand) mobile numbers possible with the series 91721. With each sub-series like 917210, around 10 thousand (9,999 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 91721 ( Nine One Seven Two One ).