Direct answer
A wrong result requires checking inputs, mode, calibration and output separately; a working control path can still be configured for the wrong state. For Android mobile hotspot, first confirm cellular works on the phone, disable VPN for one test and connect one nearby client.
What this covers
- Android mobile hotspot with this exact failure state
- Diagnosis across carrier/tethering plan versus cellular data, VPN, band and client compatibility
- Customer-accessible observation, settings and external components
What it does not cover
- ×A displayed manufacturer error code with a different documented meaning
- ×Live electrical, sealed-system, internal battery-cell or gas repair
- ×A claim that every model exposes identical controls
Capture the exact failure state
ReversibleWrite down the selected mode, input conditions and the exact unexpected output. Expected behavior: share an eligible cellular data connection over a supported secured Wi-Fi band.
Isolate the component boundary
ReversibleConfirm cellular works on the phone, disable VPN for one test and connect one nearby client. Use a known reference input or manufacturer test and compare the result. Boundary to separate: carrier/tethering plan versus cellular data, VPN, band and client compatibility.
Correct only the proven cause
ReversibleCorrect the carrier setting, band compatibility or client network profile. Correct the setting, calibration or component proven by that comparison.
Verify and stop safely
ReversibleRepeat with the reference and a normal real-world case. Do not use open security or overheat the phone under prolonged tethering.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check first when Android mobile hotspot has this problem?+
Confirm cellular works on the phone, disable VPN for one test and connect one nearby client.
Why not factory-reset immediately?+
The useful boundary is carrier/tethering plan versus cellular data, VPN, band and client compatibility. A reset can erase state without proving which side failed.
When should I stop troubleshooting?+
do not use open security or overheat the phone under prolonged tethering.
Answer for the exact device and software version shown above.