Patent ID: 7139568

Claim:
A method for providing mobile number portability service, comprising: storing mobile number portability information for a mobile subscriber, who has transferred mobile service from a first mobile service network to a second mobile service network, in a Home Location Register (HLR) associated with the first mobile service network; requesting network address information associated with a Network Provider Database (NPDB) of the second mobile service network from the HLR associated with the first mobile service network; receiving the requested network address associated with the NPDB of the second mobile service network and requesting a routing number associated with an MSISDN of the mobile subscriber from the NPDB of the second mobile service network; receiving the routing number from the NPDB and translating the routing number in a Gateway Mobile Switching Center (GMSC) of the first mobile service network; and requesting the second mobile service provider to connect a call forwarded from the first mobile service network to the mobile subscriber through a GMSC of the second mobile service network based on the translated routing number, wherein the first mobile service network is associated with a first mobile service provider, and the second mobile service network is associated with a second mobile service provider.