How do I fix outgoing iMessage failure on iPhone while receiving messages?

If you have any add-on VPN apps, remove all, restart, and test again. Remove, as disabling isn’t always reliable.

It will turn from Blue to Green if you have enabled "Send as SMS" and whenever your iPhone is not connected to the internet, it is sent as SMS (green) to all iPhone users.

It will turn from Blue to Green if you have enabled "Send as SMS" and whenever your iPhone is not connected to the internet, it is sent as SMS (green) to all iPhone users.

1. iMessage by Default: If both you and the recipient have iMessage enabled and both devices are connected to the internet (Wi-Fi or cellular data), your messages will be sent as iMessages (blue bubbles).
2. "Send as Text Message" Option: If the recipient’s device is not connected to the internet or their iMessage service is temporarily unavailable, the message may not go through. When that happens, you get an option to "Send as Text Message" — which sends the message as a regular SMS (green bubble).
3. One-Time SMS, Not Permanent: Choosing "Send as Text Message" only applies to that specific message — not future ones. Once both devices are back online and iMessage is working, future messages will continue to be sent as iMessages automatically.
4. When SMS Becomes Default: If iMessage remains unavailable for the recipient for an extended period, you can go to Settings > Messages and toggle "Send as SMS" — this lets your phone fall back on SMS when iMessage isn’t working. But again, it won’t override iMessage when both devices are connected to the internet.

I have actually missed several messages. Someone help!

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