Quick Carrier go-go Verizon Verizon QCI 8: Postpaid plans (other than Start Unlimited) Xfinity Mobile's By The Gig plan Xfinity Mobile's Unlimited plan (this requires an additional $20 for their HD Pass which also includes 1080p video streaming). Xfinity Mobile also includes HD Pass (which includes priority data) on 5G devices as well as totally unlimited data when using the C-band and mmWave networks US Mobile's Super LTE SIM offers priority data on 5G devices on all plans. QCI 9: Everything else Verizon's Start Unlimited plan Visible US Mobile Super LTE Mobi PagePlus All of the other prepaid MVNOs that use Verizon's Everyone who uses their data bucket is moved to QCI 9 as well so you end up competing with all of Verizon's heavy data users. Verizon's network is spectrum-starved in many areas so its not unusual to see complaints about Verizon's policies here.
QCI 8: