What does domestic peer-to-peer SMS mean?

Peer-to-peer short message service refers to the short message transmission from mobile phone to mobile phone. Among them, peer-to-peer SMS in the network refers to sending messages to each other between Unicom users, and peer-to-peer SMS outside the network refers to sending messages to each other between Unicom users and other network users. Please contact customer service 100 10 for details. Tips: Upgrade 4G, with more traffic and lower tariffs. Click /sAbMP for details.