What is QCI priority data and why does it matter?

Quality of Service Class Identifier (QCI) is the technical network priority assigned to cellular data packets by host carrier towers. Higher priority traffic (such as QCI 7/8 on AT&T or QCI 8 on Verizon) is processed first during cell tower congestion, while lower priority or deprioritized traffic (such as QCI 9) experiences immediate speed degradation when the network is crowded.

What is the difference between deprioritization and a hard throttle?

Deprioritization temporarily lowers your data packet priority during times of network congestion; if the local tower is not congested, you continue receiving maximum available speeds. A hard throttle is a strict ceiling applied regardless of network conditions (often 128 kbps, 512 kbps, or 5 Mbps) once a plan allotment is exceeded.

How does CellularIndex calculate out-the-door wireless taxes?

CellularIndex models federal, state, and local telecom surcharges under the Permanent Internet Tax Freedom Act (PITFA), which exempts data broadband while applying statutory voice excise taxes, Federal Universal Service Fund (FUSF) assessments, state E911 fees, and carrier regulatory recovery charges based on five-digit ZIP codes.

How does CellularIndex verify cellular subscription plans?

CellularIndex audits plans using continuous direct document analysis against live carrier legal terms, wholesale MVNO agreements, and mandatory FCC Broadband Consumer Facts labels under a strict ground-truth principle with zero sponsored placement bias.

About CellularIndex

The Independent Cellular Subscription Aggregator & Ground-Truth QoS Reality Matrix

◂ 2D Reality Matrix

The CellularIndex Mission

CellularIndex (`cellularindex.com`) is an autonomous, open intelligence aggregator and QoS evaluation engine built to solve one fundamental consumer dilemma: modern cellular marketing is aggressively deceptive.

Across the United States wireless landscape, major network operators (MNOs: Verizon, AT&T, T-Mobile) and mobile virtual network operators (MVNOs: Visible, Mint Mobile, US Mobile, Metro, Cricket, Boost, Google Fi) promote plans under the banner of "Unlimited Data". In reality, these subscriptions conceal harsh packet deprioritization tiers, severe 2G throttle slowdowns, restricted video streaming resolutions, and multi-line family math tricks.

CellularIndex continuously extracts, normalizes, and verifies raw carrier pricing, legal terms of service, and FCC regulatory filings into an objective 2D matrix—empowering consumers, network engineers, and remote professionals to inspect the unvarnished reality behind their wireless bills.

The Ground-Truth Standard: Zero Assumptions

Our Live-Verification Rule: If a carrier does not explicitly document and verify a plan limit, high-speed threshold, video resolution, or hotspot allowance in their active legal terms today, we never assume it exists.

Traditional comparison portals rely on stale affiliate spreadsheets, sponsored reviews, or cached historical records that silently mask carrier downgrades. CellularIndex enforces strict numerical fidelity across every metric:

Zero Synthetic Defaults: We never assume an unstated cap is "50 GB" or "Unlimited". If an MVNO does not disclose post-cap throttle speeds, we flag it as Unstated / Fair-Use rather than guessing.
Factual Pricing Matrices: Per-line rates for 1, 2, 3, 4, and 5+ lines are computed directly against carrier AutoPay requirements, payment method restrictions, and tax inclusion schedules.
Continuous Live Audits: Automated audits verify live plan terms daily, catching stealth throttle reductions and plan cuts the day they happen.

Understanding Quality of Service (QCI) & Network Priority

The single most consequential factor dictating your true wireless data speed during peak hours or crowded events is your plan's Quality of Service Class Identifier (QCI). When a cell tower experiences congestion, the carrier's radio scheduler serves packets based on QCI priority tiers:

How QCI Priority Works: In 3GPP cellular standards, a lower numerical value indicates higher packet scheduling priority (e.g., QCI 6 outranks QCI 7, which outranks QCI 8 and QCI 9). In our catalog and interactive filters, CellularIndex maps plans into three unified Traffic Priority Lanes (🥇 Express, ⚡ Priority, and ⏳ Standard) from highest priority to lowest:

Traffic Priority Lane	Carrier Core & QCI Profile	Packet Scheduling Treatment	Representative Plans
🥇 Express	T-Mobile Core: QCI 6 AT&T Core: QCI 7	Top-Tier Uncapped Priority: Front-of-the-line packet scheduling. Unthrottled throughput with zero tower deprioritization regardless of cell tower congestion.	T-Mobile Go5G Plus, Go5G Next, Magenta MAX, Google Fi Unlimited Plus; AT&T Unlimited Premium PL
⚡ Priority	Verizon Core: QCI 8 AT&T Core: QCI 8 T-Mobile Core: QCI 7	Prioritized High-Speed: Packets are prioritized ahead of standard/background traffic. Consistent, low-latency performance under normal to heavy cell tower load.	Verizon Unlimited Plus, Unlimited Ultimate, Visible+ (first 50GB), US Mobile Warp; AT&T Unlimited Extra EL, Cricket More; Mint Mobile, Metro by T-Mobile
⏳ Standard	Verizon Core: QCI 9 AT&T Core: QCI 9 T-Mobile Core: QCI 9	Deprioritized Standard: Packets yield to Express and Priority traffic whenever the local cell tower experiences congestion. Maximum unconstrained speed off-peak.	Verizon Unlimited Welcome, Visible Base, Tracfone MVNOs; AT&T Unlimited Starter SL, Cricket Core, Consumer Cellular; heavy users exceeding plan caps, 5G Home Internet

By classifying every plan under its actual host network QCI profile, CellularIndex eliminates marketing ambiguity and lets users know exactly what priority their packets receive.

Mobile Hotspot Pools & Speed Throttling Reality

Carriers frequently obfuscate whether tethered hotspot data draws from your primary high-speed allocation or a dedicated separate pool:

Dedicated vs. Shared Buckets: A plan advertising "Unlimited Data + 50GB Hotspot" provides 50GB of tethering that does not deduct from on-device usage. Conversely, shared-bucket plans immediately consume your high-speed quota when tethering.
2G vs. 3G Post-Throttle Hard Speeds: When an allotment is consumed, speeds drop to either 128 kbps (2G)—effectively unusable for modern web browsing—or 512 kbps / 1.5 Mbps (3G), which can still support basic audio streaming and messaging. CellularIndex documents the exact numeric throttle speed.
Video Streaming Caps: Many "unlimited" plans default to 480p SD (1.5–2.0 Mbps rate limit) unless high-definition streaming is manually activated in account settings. We explicitly log max video streaming bitrate caps.

Independent, Transparent & Privacy-First

CellularIndex was created to give consumers an unvarnished, objective view of the wireless marketplace without marketing bloat or hidden incentives:

100% Objective & Ad-Free: Zero sponsored placements, no pay-to-play carrier rankings, and no bloated third-party advertising networks degrading your browsing experience.
Privacy by Design: Zero user registration, zero account profiling, and no phone numbers or personal information collected. Research and compare plans freely without receiving telemarketing calls or sales spam.
Continuous Market Audits: Automated verification pipelines audit live carrier terms daily, catching stealth throttle reductions, pricing adjustments, and plan revisions the day they occur.

Transparent Methodology & Data Standards

We believe cellular plan comparison data should be verifiable, auditable, and held to strict consumer protection standards:

Direct Source Verification: Every listed price, QCI priority tier, and hotspot bucket is anchored directly to active carrier service agreements, fine print terms, and standardized FCC Broadband Consumer Facts disclosures.
Structured Search Manifests: Standardized, machine-readable AI search manifests (/llms.txt) are maintained for automated intelligence crawlers, independent researchers, and consumer advocates.
Zero Commercial Bias: Referral arrangements never influence our evaluation formulas, network tier classifications, or throttle disclosures. We never accept compensation to suppress carrier throttling traps or artificially inflate plan rankings.

For questions regarding our methodology, QCI testing, or to report a carrier data update, contact our research team at [email protected].