FAQ: Why is the failed delivery reason showing as "unknown" for my SMS message?

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Why is the failed delivery reason showing as "unknown" for my SMS message?

Wireless carriers sometimes filter SMS messages; however, they will not always report when or why this occurs so that spammers can't learn how to get around their filters. If the wireless carrier doesn't indicate why a message failed to deliver, Klaviyo will show the reason as unknown.

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