Iphone airplane mode ON, Wi-Fi enabled, iMessage not working?

I'm abroad and I have airplane mode on and the Wi-Fi enabled and am connected but whenever i try to send an iMessage it goes green and won't work. I checked and everyone said iMessage will work over just Wi-Fi but how do i do it?

The recipient has to have an iphone also with imessages enabled, speaking of this, go to settings>Messages and make sure iMessages are on

You have to have network connection. If airplane mode is on there's no Wi-Fi but on iPhone you don't need Wi-Fi but there isn't network connection.

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