What does Internet peer-to-peer SMS (industry port) mean?

Peer-to-peer SMS here refers to the direct SMS contact between you and a specific mobile phone (mobile and Unicom), PHS, or network SMS users. Note: What is said here is "direct". So no more than 200 peer-to-peer messages a month, there is no extra charge. If it involves other services of some internet service providers (such as participating in CCTV's prize-guessing activities), you need to pay extra.