If the service will determine that the recipient is not the owner of the iOS device or he deliberately disabled iMessage on the device, then you will receive an error from our API that the sending failed. In this case, you can already use an alternative sending method: WhatsApp, SMS, and etc. Because the exact same logic would be used if you try to send via WhatsApp to a number for which it is not installed, you will receive an error in response in the same way.

All our clients use us as an alternative gateway for messaging and almost always have several messaging gateways: iMessage, WhatsApp, Viber, SMS and etc. Therefore, we usually recommend connecting us in addition to your current SMS gateway in order to reduce the cost of sending messages to owners of iOS devices.
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