What is mobile network 313100?

Excuse me, could you please clarify what exactly is meant by the term "mobile network 313100"? Is it a specific type of mobile network technology, a unique identifier for a particular network, or perhaps a reference to a specific service or provider? I'm curious to understand the context and significance of this term, as it's not immediately clear to me. Could you provide some additional information or context to help me better grasp the meaning of "mobile network 313100"?