What if imessage of iphone 6plus always waits for activation?

1. Just restore the settings, Settings-General-Restore-Restore all settings.

2. If it is connected to wifi, you can turn off the wireless network for a few minutes, then turn on wifi again, and then activate imessage. If it doesn't work, please restore the network settings. Remember that opening an imessage phone must be successful when there is a network.

3.iMessage is different from SMS/MMS service of operators. Users only need data support through WiFi or 3G network to complete communication. IMessage takes advantage of the new message reminding system of iOS and Mac os, which can directly push information to the other party's screen, whether the other party is in the game or locking the screen. If both parties are using iMessage, you can even see the status of each other's speech.