Apple sends messages too frequently. How long does it take to send a message normally?

Operation is too frequent. Please try again later. General 15 minutes before operation.

Too many operations, please try again later, which may be caused by the current network instability.

Solution: Set up your own network in the phone settings. If there is a 3G.4G network, switch the network to a more advanced network. If there is a strong wifi signal, it is recommended to turn on wifi before operation.