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Phones & Tablets

Why does a Galaxy S25 show a One UI caution sign and no signal?

Answer

Restart into normal mode if the phone is in a software caution or safe-like state, check that the SIM/eSIM is active, then reset network settings; if the caution remains at every boot, software repair or Samsung support may be needed.

Before you start: stop right away if…

  • Do not share account passwords with callers who claim they can clear a One UI caution remotely.
  • Network resets remove saved Wi‑Fi networks.

Follow these steps

  1. Restart and dismiss temporary warnings carefully

    Restart the Galaxy S25 and read the caution message fully. If it offers a normal reboot or report option, choose the path back to the regular home screen rather than repeated forced power cycles.

    You should see: The phone reaches the home screen where signal status can be checked.

  2. Verify SIM or eSIM status

    Open Settings > Connections > SIM manager and confirm a SIM/eSIM is present and turned on, then toggle Airplane Mode on and off.

    You should see: The SIM shows active and the phone attempts to register on the network.

  3. Reset network settings

    Go to Settings > General management > Reset > Reset network settings, then retest signal after the phone restarts.

    You should see: Cellular signal returns, or no-signal status remains.

  4. Contact carrier or Samsung if caution persists

    If the caution sign returns every boot or signal never registers, contact the carrier to refresh the line and Samsung support for software repair options.

    You should see: A line refresh or software repair path is started.

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Extra tips

What to look for: One UI caution messaging at startup, no signal or no bars, SIM status in Settings, and whether Wi‑Fi still works

Before you change anything: Remove and reinsert a physical SIM only if the phone uses one and you are comfortable doing so. Note any recent update or drop before the caution appeared. Resetting network settings clears Wi‑Fi passwords. Back up what you can over Wi‑Fi before deeper software repair.

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