Hi niaza86813525,
While running the "Mobile Carrier" reports with "Visitors" metrics, "None" represents all those visitors for whom "Mobile Carrier" information was not available. All such visitors will be categorized under "None" while running the report.
Adobe maintains a known range of IP addresses that belong to mobile carriers. When a hit is received from an IP range that belongs to a known mobile carrier, the hit appears as "Mobile Carrier" on the Connection Type Report. Otherwise, mobile traffic is listed under "Lan/Wifi".