If he's from outside the network, Visitor Location Register (VLR) will be used to track the call.

如果他不属于这个网络，那么将会使用“异地注册(VLR)”来跟踪电话。

youdao

If he's from outside the network, Visitor Location Register (VLR) will be used to track the call.

如果他不属于这个网络，那么将会使用“异地注册(VLR)”来跟踪电话。

youdao