I tried to send a message. After that, it displays the following toast:
SMS is unable.
I can't use SMS. Is there a method to send messages by not using SMS?
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Google Messenger is an SMS/MMS application. If you are not able to send SMS/MMS for some reason, you need to use a different messaging system and a different application. For example, you can use email, or a proprietary service like WhatsApp. If you need your message to arrive as an SMS, you can use a email-to-SMS gateway, though you need to know the carrier used by the recipient.
If you need your message to arrive as an SMS, you can use Google Allo.
However, to solve your problem, you might want to try a factory reset.