Connectivity

No Signal on Android: Causes and Fixes

Zero bars or 'emergency calls only', SIM, radio and coverage diagnostics.

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'No service' is either the SIM, the phone's radio state or genuine coverage. Isolating which takes three quick tests, and most cases end at a re-seated SIM.

  1. 1Toggle airplane mode; then restart the phone.
  2. 2Power off and re-seat the SIM; inspect contacts, clean gently with a dry cloth.
  3. 3Manual network selection: Settings → Network → SIM → automatically select network OFF → pick your carrier → back ON.
  4. 4Test SIM in another phone (SIM dead?) and another SIM in yours (phone radio dead?).
  5. 5Check carrier outage maps/social; rural areas may simply lack your band.
  6. 6Update the system, carrier settings ship in updates.

Tip: A phone that lost signal after a drop or water may have a damaged antenna, that one is a repair-shop diagnosis.