If 400 calls are charged, the caller of 400 calls only needs to pay the local call fee, and the householder of 400 calls only needs to pay the answering fee of 0. 15 yuan/minute. 400 calls are not limited, and can be dialed by fixed line, mobile phone and PHS. No need. Customers can dial your 400 number in any city where the 400 number has been opened, and only need to pay the local call fee. 400 is not a completely free phone call, but no matter whether the company you call 400 is local or out of town, you only need to pay the local phone bill, and the called party pays the corresponding tariff.
If you think it's good, you can consult their website if you don't understand anything. Baidu search: 400 phone calls will do. Users who make 400 calls only need to pay local calls, that is, according to their own local calls. You don't have to pay the long-distance phone bill.