Is there a difference between on-net and off-net messages via mobile phone text messages?

Hello, the difference between inter-network SMS and intra-network SMS:

Intra-network SMS means that the mobile phone numbers used by the sender and receiver belong to the same communication operator (such as a telecommunications number Send a text message to a telecommunications number).

Internet text messages refer to when the numbers used by the sender and the receiver belong to different communication operators (for example, a telecom number sends text messages to a China Mobile or China Unicom number).