What does the mobile operator see?

Question

network hardware

There is Internet access via a 4g modem with a SIM card + wi fi router. The modem is connected to the router via USB. What equipment identifiers can the mobile operator see? ?

Answer 1

IMEI of the modem, MAC of the modem, then, depending on the settings, also some network data of the router.

Answer 2

Read about setting TTL
https://4pda.ru/forum/index.php?showtopic=596728&st=60
Sees
1. IMEI
2. IMSI
3. TTL
4. Your traffic before windows update
5. In general, all traffic and DPI suggests that this is for garbage, and by the way sends ssl traffic to the very bottom, like torrents