Because people often use multiple connected devices, they have to maintain multiple locally-stored address books. Synchronizing contact information on all of these connected devices becomes an increasingly complex task. appNGIN synchronizes contact information across multiple platforms, enabling operators to personalize and simplify their messaging services. Network Address Book is a multi-access address book that helps users manage, synchronize and access all their stored contacts on any device. In addition, the Network Address Book can be integrated with other service enablers via standards-based API integration to offer converged services.