Model reference · Updated October 2026

Ulefone Armor 28 Ultra Thermal Version

The fastest thermal phone Ulefone sells. The same 640×512 sensor as the Armor 29 Pro Thermal, on flagship silicon with a 1-inch main camera — and half the battery.

Independent · no brand involvement Manufacturer specs · not independently tested

The Ulefone Armor 28 Ultra Thermal Version is Ulefone's performance flagship with thermal imaging: a ThermoVue T2 sensor at 640×512 and 25 Hz, a MediaTek Dimensity 9300+, 16 GB of LPDDR5X with 1 TB of UFS 4.0 storage, a 50 MP Sony IMX989 1-inch-type main camera with 8K video, and a 10,600 mAh battery with 120 W wired charging. It carries IP68, IP69K and MIL-STD-810H ratings and ships on Android 15, with Ulefone stating an over-the-air update to Android 16.

Same sensor, different phone

The thermal hardware is the same generation as the Armor 29 Pro Thermal: a ThermoVue T2 at 640×512, refreshing at 25 Hz, with Ulefone's SharpenAI processing on top. Ulefone's own claim for the 28 Ultra is a dedicated infrared image processor that runs the thermal pipeline separately from the main chip, with a stated ±2% accuracy. In practice the imaging capability of the two phones is the same class; what differs is everything around it.

That makes the choice between them unusually clean. The 28 Ultra spends its budget on a Dimensity 9300+, a 1-inch-type main camera, Wi-Fi 7 and 1 TB of fast storage. The 29 Pro spends it on a 21,200 mAh battery and a 1,000-lumen work light. Neither is the “better” thermal phone; they are thermal phones for different days.

Where the flagship spend shows

The Dimensity 9300+ is genuinely flagship silicon — an all-big-core design that Ulefone pairs with LPDDR5X memory and UFS 4.0 storage, and with a large cooling layer it quotes at 15,314 mm². For anyone running survey, mapping or CAD viewers alongside the thermal app, that headroom is the reason to pay for this model over the Dimensity 7400 in the 29 Pro.

The camera module is the other differentiator. A Sony IMX989 is a 1-inch-type sensor, the largest Ulefone fits to any phone, and the 28 Ultra is the only model in the catalogue that records 8K video. Treat the sensor size as potential rather than result: across the Armor line, published reviews and owner reports find image processing lagging the hardware, and close-focus work is a recurring complaint.

USB 3.2 Gen 2 is easy to overlook and useful in practice. Thermal and 8K files are large, and a 10 Gbps cable — included in the box, according to Ulefone — turns a slow transfer job into a quick one.

The battery trade

10,600 mAh is large for a conventional phone and small for this catalogue, where the endurance models run past 20,000 mAh. Ulefone rates it for two days of demanding use. With 120 W wired charging and 50 W wireless on a stand, the practical pattern is a phone that tops up quickly rather than one that goes a week without a charger.

Reported weaknesses

Drawn from published reviews and aggregated owner reports across the Armor range, not from testing this unit.

• Camera processing behind the sensorThe 1-inch-type sensor is real; the consistency of the output is where owner reports diverge from the spec sheet, particularly in low light and close up.
• Call and microphone clarityComplaints that callers cannot hear the user clearly recur across Ulefone generations. Test it inside the return window.
• Update transparencyUlefone states an Android 16 update for this model, but publishes no security-patch schedule. Fleet buyers needing a stated support window should look at Samsung's XCover line.

Alternatives

• Armor 29 Pro Thermal — same 640×512 sensor, Dimensity 7400, 21,200 mAh and a 1,000-lumen work light. The pick when thermal is the job and battery matters more than speed.
• Armor 27T Pro+ — FLIR Lepton 3.5 at 160×120, far lower resolution, a lighter 441 g body and a lower price tier.
• Every Ulefone thermal phone compared — the full table, sensor by sensor.

Common questions