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Deprioritization

When a cell tower is congested, the network slows down some customers' data first. MVNO and lower-tier postpaid customers are usually deprioritized before MNO premium customers.

Deprioritization is how cellular networks handle congestion. When a tower has more demand than capacity, the network applies traffic-priority rules: certain customers get full speed, others see throttled speeds for the duration of the congestion event.

How priority is set

Each customer's SIM has a priority level (technically a "QCI" — QoS Class Identifier — value). The MNO sets these. From highest priority to lowest:

  • FirstNet (AT&T) and Verizon Frontline. First responders get top priority always.
  • MNO premium postpaid. Verizon Plus / T-Mobile Go5G Plus / AT&T Premium customers.
  • MNO standard postpaid. Cheaper postpaid plans on the same MNO.
  • MNO-owned MVNOs. Visible, Cricket, Metro, Total — sometimes equal to MNO standard, sometimes a step below.
  • Independent MVNOs. Mint, US Mobile, Tello, etc. Usually deprioritized first.

What deprioritization actually feels like

Outside congestion, deprioritization has zero impact — everyone gets full speed. During congestion (rush hour in dense areas, sports stadiums, large events), deprioritized customers see speeds drop to 1–5 Mbps while priority customers stay above 50 Mbps. For most use cases (texting, social, streaming music) the deprioritized speed is still fine. For video streaming or heavy data work it's noticeable.

Deprioritization vs throttling

Different things. Throttling is a hard speed cap that applies always, usually after you exceed a data threshold. Deprioritization only kicks in during congestion.

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