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Why does Apple 6 receive short messages so slowly that it can be received in a few hours?

By default, iphone sends SMS via iMessage, although it sends SMS via the network by default. This is Settings-Information-Open iMessage and send it through the network. It was sent by the operator after the shutdown, that is, the signal was sent.

This situation of yours must be caused by the poor signal where you are standing. You can turn it on in Settings-Information-As SMS Send Switch. In this way, if there is something wrong with your network, you can send text messages through the operator.