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Best answer by StefanUE
So in terms of “device unreachable”, it can be any of the following: recipient’s device is not in a service area, not accepting messages, or the device is off and cannot receive SMS. It’s not immediately clear from your screenshot which of these reasons is applicable, but the “not accepting messages” one would be the most common. It can happen for various reasons, such as power saving mode turned on, filters and blocks switched on for SMS, etc.
Regarding the segment you wanted to create, THIS Help article will provide you with a detailed overview of what that’s supposed to look like.
Hope this helps! Happy to chat further
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