Does the 4G03 router automatically switch to 4G if the wired internet connection fails?
Yes, the 4G03 supports failover between Ethernet and 4G connections. If the fixed internet connection fails, the router can automatically switch to a 3G or 4G network to maintain internet access. (Page 3)
From the official Tenda 4G03 N300 Wifi 4G Lte Router manual, page 3
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