In most cases either would work fine unless you have some unusual layout and conditions. Buy from a company with a good return policy and try one out. If it does not work for you, return it.

The default userid and password is most times printed on the device. If not check the user doc. Most times it is admin/admin or such. If you changed and lost the user id/password, then you must do a...

Try using your actual ISP IPv4 address with the port number. Also try using the Tether app.

If it is working fine, I would just ignore it. If you have any issues or it just bugs you, try a factory reset and re-enter all of your settings.

Do not know of any function in the router. Something you may want to try is to set up port forwarding and assign a specific ip address and port to the PC-A and see if you can ping that port over the...

Selin is correct, be sure to use passwords and the wireless security (WPA2 and encryption) Also be sure to use a different SSID than the other networks. Also most devices that have used a specific...