I have a cord that goes from the modern router into my PC.

Basically I'm hard wired to the Internet. Now the new device we got last Saturday has both 2.4ghz and 5ghz.

I noticed on my TV and on my phone I can use 5g. Can I use 5g if I'm hard wired? It's definitely not using the right now because it keeps cutting out. But it's perfectly fine on the phone.

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joe438 · 61-69, M

The 2.4 and 5 G are for the WiFi radio. If you're wired to the router you aren't using the radio, but other people in your house could be if they have the passwords. Your wired connection might be faster and should have lower latency, so if the wire isn't a problem, just stick with that. For security you might consider turning off the radio. No one can hack in if the radio is off.