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Network, coverage and speeds · 2026-10-05

What conditions make a prepaid mobile speed slower than its cap

A speed cap is a ceiling, not a promise. Here are the published conditions that decide what you actually get.

Two different numbers get called the speed of a prepaid plan. One is the cap, which is a ceiling the provider applies to the data in a recharge. The other is the speed you achieve, which depends on conditions the provider does not control. Only the first is a promise.

What the cap is

The plan page states that your capped download speed is the maximum potential download speed for the data included in your recharge. That definition matters: it is a potential maximum for the tier, not a throughput guarantee on your line.

The published conditions that reduce it

The Critical Information Summary lists them plainly. Speeds vary with location, distance from the base station, local conditions, concurrent users, hardware and software configuration and download or upload destination. The live plan page adds terrain and the download source to that list.

What the cap numbers look like

RechargeDataCap
$146GB150Mbps
$288GB150Mbps
$3930GB150Mbps
$4945GB150Mbps
$5955GB250Mbps
$74100GBUncapped

Note where the cap actually moves: not at 45GB but at 55GB, and the top tier is uncapped rather than a higher number. If you pay for a 100GB plan, the cap column is the one place where your experience can genuinely be unlimited; below that, it is a ceiling you will rarely reach.

What we could not verify. Where a provider has not published a figure we mark it unknown rather than estimate it. Re-read the provider page linked below on the day you decide.

Sources and verification

Every figure on this page comes from the official page or Critical Information Summary below, checked on the stated date. Prices, allowances and expiry terms can change — recheck before you buy.

  • Boost Mobile Prepaid Critical Information Summary — Boost Mobile (Telstra Pre-Paid Mobile Network) (checked 2026-10-05) <span class="quiet">Recheck by 2026-11-04</span>
    • An LTE band 3 (1800MHz) and band 28 (700MHz) capable device is required. (fact, checked 2026-10-05)
    • Speeds vary with location, distance from the base station, local conditions, concurrent users, hardware and software configuration and download or upload destination. (fact, checked 2026-10-05)
    • Download caps run 150Mbps, 150Mbps, 150Mbps, 250Mbps, then uncapped. (fact, checked 2026-10-05)
  • Prepaid plans - Boost Mobile — Boost Mobile (Telstra Pre-Paid Mobile Network) (checked 2026-10-05) <span class="quiet">Recheck by 2026-10-19</span>
    • Your capped download speed is the maximum potential download speed for the data included in your recharge. (fact, checked 2026-10-05)

Coverage is not promised address by address. Check the provider's own coverage map for your location.

Apply what you learned.

Use your own budget, data need and expected start date to compare the documented plans.

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