The person you have called is not accepting calls.

Usually it means they have either suspended service or have not refilled a prepaid plan. Text message can be sent but it won't be delivered unless they reactivate their service

Does suspended service mean the person didn’t pay their phone bill yet? If the person changed their number will it say the same message that the person is not accepting calls at this time or will it say that the number is no longer in service? 

Or they voluntarily suspended if phone was lost

So is their phone number still the same or could it be a possibility that the message I’m receiving when I call means that the person has changed their phone number? 

No 

So the person number is still the same?

 How am I suppose to know? 

All I do know is that is the message for a suspended number or unpaid plan.  For all I know they let it expire and got a new number.  There is no way I can know for sure.

This is not true because we are having this issue with my daughters phone which is on my plan that I pay for so she has service and this is happening when people call her sometimes and then sometimes it goes through.  Its really random.  They are not blocked either.  We are trying to find a fix as well.  

@cwiggins85 That doesn’t mean the previous response is not true, it just means it doesn’t apply to your situation. There are multiple reasons a caller could get that response. Perhaps your daughter’s case indicates something wrong with the phone or maybe she puts her phone in do not disturb mode.