Repair guide Galaxy S21 (SM-G991B) - English - Rev.1.0

Quality Test

SIM card • Function: Check whether the SIM card is working normally. • Provided information ‒ Status: View whether the feature is working normally.

‒ Service provider: View the carrier. ‒ Number: View the phone number.

If the test result is not Normal , remove the SIM card from the SIM card tray and replace it. If possible, try again with another SIM card. Power restart status • Function: Check your device’s restart history. • Provided information ‒ Status: View whether the feature is working normally. ‒ FAQ: View frequently asked questions. ‒ History: View your device’s restart history. Official software • Function: Check whether the software is working normally. • Provided information ‒ Status: View whether the feature is working normally. ‒ Service information: View the Samsung Service Center location.

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