Several reasons why the mobile phone is out of power.

There are several reasons why the mobile phone is empty:

1. The SIM card the mobile phone is using may be damaged.

2. If the cell phone signal in the other party's area is not good, the opportunity to call the other party will be prompted as an empty number.

3. The other party used call forwarding, chose no answer forwarding, and went to an empty number, which caused this phenomenon of becoming an empty number after getting through.

4. If the other party pulls himself into the blacklist, it will be prompted as an empty number.

The meaning of space:

1 refers to a phone number that is not used, or a phone number that does not exist has been cancelled.

2. The original mobile phone number used by someone, and later the mobile phone number is cancelled, the mobile phone number will become an empty number. After a period of time, the cancelled number will be resold by the operator and become someone else's new mobile phone number.

How to detect an empty number:

1, through the number detection (empty number detection), it can not only ensure the publicity effect, but also greatly reduce the publicity cost. According to an empty number detection report (number status distribution report) regularly published by a well-known empty number detection website, short messages are being sent in groups.

2. The average number of idle mobile numbers exceeds 30%, while that of China Unicom and China Telecom exceeds 60%. So many invalid numbers not only waste a lot of publicity costs, but also make operators think that they are maliciously sending spam advertisements, which will greatly reduce the publicity effect.

3. Therefore, with the prosperity of SMS advertising business, the space number detection business as a derivative service also came into being, and helped the healthy development of SMS advertising. In addition, with the increasing cost of wireless advertising, space number detection has become an indispensable profit tool for telemarketing and SMS advertisers.