Sony Xperia 5 III User Manual page 199

Handset is connected.
The password, for a household wireless LAN router, is sometimes found on a sticker on the
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router (WEP, WPA, KEY, etc.). Contact the router manufacturer for information. For password for
a public wireless LAN, check with user's service provider.
Entering a password is not required if an access point is not security protected.
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Wi-Fi／Bluetooth