What is what does it mean when it says the wireless customer is not available?

When it is mentioned that a wireless customer is not available, it typically means that the person or device associated with that wireless number is currently out of coverage range or is not reachable for some reason. This could be due to a variety of reasons such as the phone being turned off, in airplane mode, or experiencing technical issues that prevent it from receiving calls or messages. It could also mean that the person is currently busy on another call or has their phone on "do not disturb" mode. In some cases, the wireless customer may have temporarily deactivated their phone service or changed their phone number.