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Panic error

Baseband panic on iPhone

Part to check: Baseband (modem) section

Baseband is a kernel panic that makes an iPhone restart on its own, usually leaving a Panic-Full log under Analytics Data. When this error line appears, the first part to check is Baseband (modem) section. Severity is rated high, and confidence in this diagnosis is likely. Below you will find what the error means and its most common causes; to pin down what is wrong with your phone, scan the log with the Panic Scan app.

Basic information

Code
Baseband
Category
Baseband / Cellular
Severity
High
Confidence
Likely
Part to check
Baseband (modem) section

What it means

The modem/baseband stopped responding. Often with no signal, no IMEI, or freezing during calls.

Common causes

  • Faulty baseband IC / baseband CPU
  • Baseband power (baseband PMU)
  • Separated stacked logic board (iPhone X and later)

For reference only, compiled from repair documentation and community data. The same error can come from more than one part; always confirm on the actual device.

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