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They are all Apple phones, and only know each other's Apple ID. How to send imessage?

Activate imessage first.

1. Because iMessage sends information through the network, you need to connect your mobile phone to the cellular mobile network or wireless network before sending it. Find the "Settings" icon on the iPhone home screen, and click Open, as shown.

2. Click the "cellular network" option in the settings list, as shown in the figure.

3. In the cellular mobile network settings, turn on the cellular mobile data switch, as shown in the figure.

4. If you have a wireless network, click the WLAN option in the Settings list to connect to your own wireless network.

reference data

Bbs。 Mobile phone China [reference time 20 17- 12-27]