What does cluster network mean?

The full name of cluster network: comprehensive VPMN network, referred to as V network. It’s better not to use too many professional terms, just keep it simple. This kind of V network is divided into two main categories. One is that you can call each other locally for free (the number of minutes is given in the package, for example: Guangxi has a package of 300 minutes of calls for 5 yuan, 1000 minutes of calls for 10 yuan...); two Classes can roam within the province and make calls to each other for free. That is, if A and B join the same cluster network, then they can roam within the province for free within a few minutes. To add network requirements, you must go to the business hall to apply for your ID card and employer certificate. Another requirement is that both parties must be on the same network to enjoy the free discount. That's about it. If you don't understand, just ask more questions. I hope it can help you.