The person may be using a calleridentification service, and may only accept calls from recognized callers.
他可能使用了呼叫识别服务，只接收已经承认的呼叫者的呼叫。
2
The call was rejected by the person you called. The person may be using a calleridentification service, and may only accept calls from recognized callers.
此次呼叫被对方谢绝。他可能使用了呼叫识别服务，只接收已经承认的呼叫者的呼叫。
3
If you're getting prank calls or if you find a number on you calleridentification that you don't recognize, you probably want to find out who is behind that number.