How many days does the home network SMS invitation expire?

The home network SMS invitation will expire in 2 days. Home network is a preferential calling service. One person pays the main number and the whole family can enjoy it. There are at least 2 people in the network and at most 19 people. All members in the home network can play with each other indefinitely. A number can only join the 10 home network at most. Take China Mobile as an example, SMS is usually valid for 48 hours. SMS will be stored in the system for 48 hours. If the phone is turned off or stopped, the system will keep the SMS for 48 hours. If you turn on your phone or receive a cell phone signal within 48 hours, the system will push the SMS to your cell phone. If it exceeds 48 hours, it cannot be received after the deadline, and the short message cannot be retrieved.