In mobile or wireless networks, it is one of the most important technologies to track the location of the mobile users. The mobility management basically is performed by using two databases, HLR(Home Location Register) and VLR(Visitor Location Register). A mobile user move anywhere in mobile networks, location registration for call tracking is always needed. And those registration operations cause costs because of many network traffics. In this paper, we propose a new simple mobility management by registering frequently dialed mobile phone numbers in a database, so called fVLR. We store and manage VLR of which a mobile user frequently visits location using fVLR database. And then when set up the call path between mobile users, first of all the VLR of the caller queries the callee?s fVLR database for searching the location of the callee instead of requesting to HLR of the callee. The proposed fVLR database is stored or updated whenever mobile phone numbers are dialed by mobile users, that is, fVLR can be inserted by frequent dialing or deleted by no dialing during a certain period. Using the fVLR database, we can reduce the cost of maintaining location of mobile users.