What does it mean if an iPhone user can receive calls but not iMessages?

My boyfriend and I were on the phone when he suddenly hung up. I tried calling back and it rung until it went to voicemail. I texted him, but it won't send unless I send it as a text rather than an iMessage. We were talking about something important so I'm kind of worried

It won't send iMessages if you're not connected to the Internet

No idea check with apple

So send it as a text message, maybe he has imessage off.

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