Hello, depending on what the number is or what the number is, for example, Nanchang's mobile wireless landline, shut down for a month or two, the number into the sale state, so that it can not be filled, the second is that if it is a Tietong number, the online or small business hall is not filled.
1: If it is used for a long time, it is generally the rechargeable battery that fails, and this problem occurs the most.