Samsung Galaxy S21 SG User Manual page 13

Getting started
NOTE Best 5G performance requires optimal 5G connection and unobstructed
antennas (rear of device); see carrier for network availability; 5G performance
may be impacted by a case or cover.
Use the Setup Wizard
The first time you turn your device on, the Setup Wizard guides you through the basics
of setting up your device.
Follow the prompts to choose a default language, connect to a Wi-Fi
accounts, choose location services, learn about your device's features, and more.
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network, set up