Member Avatar for Bhaskar_1

Tower(network) and sim is not showing in Samsung on7
What will I do

Edited by Reverend Jim because: added title to thread
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Dani AI

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The comments about the S7 battery from and are off‑topic for a Galaxy On7. Below are focused, practical checks (from easiest to more advanced) to isolate whether the problem is the SIM, the carrier, the OS/firmware, or the hardware.

  1. Soft checks first

    • Reboot the phone and toggle Airplane mode on → off.
    • Remove the SIM, clean the gold contacts with a soft dry cloth, reseat it and power on.
    • If the device has two SIM slots, try the same SIM in the other slot.

  2. Verify the SIM and carrier

    • Put the SIM into another known‑working phone. If it works there, the SIM and carrier are OK.
    • Try a different (working) SIM in the On7. If that SIM is detected, the original SIM or carrier provisioning is the issue.

  3. Settings and diagnostics

    • Check Settings → About phone → Status (or SIM status) for any message like “No SIM” or “SIM not provisioned.” “SIM not provisioned” usually means carrier/activation; “No SIM” usually means the phone is not detecting the card.
    • Dial *#06# to confirm the IMEI. If the IMEI or Baseband shows “Unknown,” that points to a firmware/baseband/EFS problem.

  4. Software troubleshooting (safe, then destructive)

    • Boot to Safe Mode (use the power menu long‑press Power off → Safe mode) to rule out a third‑party app.
    • From Recovery mode, wipe the cache partition (does not erase personal data).
    • Backup everything, then do a factory reset only if other steps fail.

  5. Advanced / final steps

    • Reflash official stock firmware only if comfortable and using correct files/tools, or have a shop do it.
    • If after a factory reset and firmware reinstall the SIM still isn’t detected, the SIM reader or radio board is likely faulty — take the phone to an authorized service center or a reputable repair shop.

Cautions: backing up before a factory reset is essential. Do not attempt board‑level repairs unless experienced. The steps above are ordered to avoid unnecessary data loss.

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Member Avatar for rubberman

Samsung S7? They have bricked all of those phones because of the danger of the batteries exploding.

Member Avatar for rproffitt

The S7 was from I recall was indeed bricked world wide.

Advice: Get your full refund (everyone I know got a full refund) and then wait for the resurrection model S7.

The word is they will refurb and re-fit these with a smaller battery.

Member Avatar for rubberman

The main problem, from the engineering perspective regarding the S7 battery problem, was that they wanted a really long runtime between charges on the battery, so they designed it to barely fit in the case (made as big as possible), and as it heated up and expanded, it would short circuit, causing the fires and explosions we have seen. The smaller battery will likely not have that problem, assuming that they allow adequate expansion room inside the case.

All that aside, I love my S5. Removable/replaceable battery, plenty of room for heat expansion, a back cover that can easily pop off if this problem were to occur.

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