有些地方需要更新，比如xfinity现在只有最贵的UNLIMITED PREMIUM plan和by Gig plan还有QCI8，其实只有QCI 9.欢迎大家补充。
几个亮点：
US mobile最便宜的10刀 2G by Gig plan在Verizon优先级居然比Red Pocket 10刀1G高
US mobile ATT的plan交钱可以boost到QCI 8.
原帖地址：
https://www.reddit.com/r/NoContract/comments/1cyfjpp/data_prioritization_policies_of_the_carriers_and/
Verizon
Verizon only uses 3 QCI classes – 7, 8, and 9.
QCI 7 is reserved exclusively for Verizon Frontline customers so this priority level may as well not exist for those of us who aren’t first responders.
QCI 8 is given to the business Plus 5G, business Pro 5G, consumer postpaid plans (other than Welcome Unlimited), all of Xfinity Mobile’s plans, all of Spectrum Mobile’s plans, Lexvor, and MobileX. US Mobile’s Warp 5G SIM offers QCI 8 data on 5G devices only. Visible+ has QCI 8 as well until 50GB of LTE/5G Nationwide data is used (5G UW is unlimited QCI 8). Total Wireless’ Total 5G Unlimited and Total 5G+ Unlimited plans have unlimited priority data included.
QCI 9 goes to everything else. The Start 5G business plan, branded prepaid besides the Unlimited Plus plan, Visible’s base plan, US Mobile Warp 5G when on an LTE only device, Mobi, and all other prepaid companies that use Verizon’s network are known to assigned to this QCI. Anyone who uses their premium data bucket on Verizon’s brands will be moved to QCI 9.
Other TracFone brands are up in the air. I have gotten reports of priority data (and seen it myself on SafeLink, a TracFone brand) but I’ve also gotten reports of deprioritized data, complete with screenshots. It seems to be random what people get so if you absolutely require priority data, it might be best to look outside of the TracFone brands.
AT&T
AT&T uses QCI 6, 7, 8, and 9.
QCI 6 is reserved for FirstNet customers (with primary status), Business Unlimited Premium (only data that qualifies for Business Fast Track, the rest is QCI 7), and some corporate responsibility plans.
QCI 7 is assigned to Business Unlimited Premium as well as Unlimited Premium PL and Unlimited Extra EL customers who pay $7 for AT&T Turbo. FirstNet extended primary plans get QCI 7 as well.
QCI 8 is assigned to Business Unlimited Advanced, Unlimited Extra EL, Unlimited Premium PL, Prepaid Unlimited Max, Prepaid Unlimited Max Plus, Cricket More, as well as plans offered by H2o, Consumer Cellular, and PureTalk. US Mobile’s Dark Star offering has an addon to bump it to QCI 8 from QCI 9.
QCI 9 is assigned to Business Unlimited Starter, the base Unlimited plans for both the postpaid and AT&T Prepaid brands, Cricket Core, other known MVNOs, and all AT&T brands once their premium data buckets have been exhausted.
T-Mobile
T-Mobile uses QCI 6, 7, and 9 for phone plans.
QCI 6 goes to all branded plans, both postpaid and prepaid, besides those with Essentials in the name. Google Fi has QCI 6 as well.
QCI 7 is applied to Essentials branded plans as well as all other known MVNOs.
QCI 8 is not used for phone plans, it’s used for on device hotspot and for data only plans with 30GB of more data.
QCI 9 is for those who have exhausted the data in their buckets.