他的手机整整响了两个月，非常终他决定更换电话号码。
His phone continued to ring for two months until he decided to change his number.
顾客：你好，我准备更换手机服务，想知道能否继续使用旧的电话号码。
Customer: Hello! I am planning on switching my phone company. I was wondering if I could keep my old number.
本地移机不变号数据库(lnpdb)，lnpdb是可以使陆上电话和无线用户在更换服务提供商后仍能保持移动电话号码不变的一个msc特性。
Local Number Portability Database (LNPDB), the LNPDB is an MSC feature that enables both landline and wireless subscribers to keep their Mobile Directory Number when changing service providers.
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