TP-Link Deco X50-4G - PIN Management (for 3 G;4 G Router Mode); Enable PIN Code and Manage Settings

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Change the mobile network mode
(4G Preferred / 4G Only / 3G Only)
according to your needs.
Enable Mobile Data to ensure
internet access.
Enable Data Roaming to ensure the
internet access while you are outside
the service area of your carrier.
Select frequency bands manually
or automatically.