Android UWB is being artificially restricted on Galaxy S24 Ultra

[Technical Investigation] Samsung is Artificially Restricting UWB on Galaxy S24 Ultra
The Hardware Context
The Galaxy S24 Ultra uses Qualcomm’s QBT4000 UWB chip, the same silicon found in the Pixel 8 Pro and iPhone 15 Pro. The hardware, antennas, and firmware are present and operational. However, Samsung appears to be disabling the UWB Direction Engine (TSS – Time Synchronization System) unless a Samsung SmartTag is detected.
Diagnostic Evidence (ServiceMode)
When checking internal diagnostics via ServiceMode, the device reports limited capabilities for non-Samsung hardware:
* Distance: Supported
* Azimuth: Not Supported
* Elevation: Not Supported
* Status: NO TSS DEVICE
> Why TSS Matters: The TSS is required for IEEE 802.15.4z UWB direction finding (Angle of Arrival, Elevation, and AR arrows). Without it, the device is forced into "UWB Lite" mode, providing only approximate distance.
>
Observed Behavior: SmartTag+ vs. Moto Tag
| Feature | Samsung SmartTag+ | Moto Tag (Google FMD) |
|---|---|---|
| TSS Status | TSS Loads | TSS remains disabled |
| UWB Mode | Full direction finding | UWB stays in "Lite" mode |
| AR Finder | Works perfectly | No AR / No azimuth |
| Precision | Full spatial data | Coarse distance only |
The Conclusion
The same phone, same firmware, and same UWB chip behave differently based only on the tracker brand. This proves Samsung is gating the UWB HAL / firmware interface based on accessory identification.
While Pixel phones using the same chip expose full UWB direction finding to the Google Find My Device network, Samsung is overriding Android’s UWB stack at a vendor level to block competitors.
This breaks:
* Android interoperability
* IEEE 802.15.4z compliance
* Google’s cross-vendor Find My Device UWB network
This is not a hardware limitation; it is a deliberate vendor lock.

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