iMessage sends through email or not at all
Why won’t my iMessage operate through my phone number?
iPhone XR, iOS 13
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Contact your Carrier (Cellular Service Provider) The agency who issued the SIM to you to know whether you have a SMS plan enabled at least for One SMS
If your iPhone is used with a carrier not found in the wireless carrier articles, make sure you can send and receive international SMS.
See the pic below
4 Step Process --> Turn off and restart iMessage and FaceTime (The order / sequence is very important)
- Go to Settings > Messages and turn off iMessage.
- Go to Settings > FaceTime and turn off FaceTime.
- Restart your device.
- Turn iMessage and FaceTime back on (Watch the GIF hereunder)