If you’re out of range, or your phone is off, the message is stored by the mobile switching center for a short time until you can be located by the network.

当你不在基地台服务范围内或手机关机，讯息就会先暂存在行动交换中心，直到手机又可以让网路侦测到收讯。

If you're out of range, or your phone is off, the message is stored by the mobile switching center for a short time until you can be located by the network.

当你不在基地台服务范围内或手机关机，讯息就会先暂存在行动交换中心，直到手机又可以让网络侦测到讯号。

These signals are then picked up by the tower closest to them, which converts the radio waves into a digital electrical impulse and passes it along to a hub of the network called a mobile switching center.

这些讯号由最接近的基地台接收，并将无线电波转换成电子讯号，再传送到名为“行动交换中心”的网路枢纽。