Research on clustering problem of mobile phone short messages

Hello. Do you still work in Shenzhen? If so, you can go to Shenzhen to handle it locally. Only when your card is there can you handle this business. If you want to open your own and other people's numbers, you have to go to the mobile hall, but only if all the numbers are in one place. For example, if your card is from Shenzhen, all numbers that want to enter the cornet must be from Shenzhen. If you don't go anywhere, this business is good, but it's usually 10 yuan.