How do I send messages from iPhone to Android?
Another simple fix for the issue of not sending text message android is to unblock the caller. If the person on the other end of the line is blocking your calls, unblock the caller's phone number. Then, you can try to send text messages to the other end. If you can't receive texts from the other side, you can try removing the SIM card. Once you've done this, you'll be able to send texts to the other party.
See also - https://emailspedia.com/why-are-my-text-messages-not-sending-from-android/
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