For Mumbai telecom circle, MTNL (DOLPHIN) has been allocated 3 mobile Number series. These mobile number series are: - 9757, 9869 and 9969. Unless otherwise a consumer has opted for Mobile Number Portability (MNP), if his/her number starts with any of these series 9757, 9869 and 9969. then you can certainly say that the number belongs to Mumbai telecom circle and the telecom operator is MTNL (DOLPHIN).

You can view the list of all mobile series of MTNL (DOLPHIN) in Mumbai below: