Hello and thank you for your question. I look forward to assisting you today. If you reset back to factory then you will need to go into the setup and rename your router (dlink) to whatever it was before the reset. Any router you setup, will by default, be named as the manufacturer.
Have a nice day!
A new expert here --
What make/model phones are having the issue?
I can see everything from before -- You mentioned the two phones are connecting to an unsecured network. What is the make/model of those phones?
It depends if the issue is the router setup or if the phone is looking for a Wi-Fi network and connecting automatically from the wrong one.
The reason that I asked about the phone model was to provide you with the steps to view the available Wi-Fi networks and see if your new Wi-Fi name appears in that list.
Are you able to look at the Wi-Fi list on the phones and check to see if your Wi-Fi name appears within the available networks?
It is impossible to have the Wi-Fi name appear protected on your computer but not the same on your phone so it is likely an issue with the phone picking up the wrong network.
It is possible that your other devices are seeing a "guest" network instead of the same one on your computer. Let's test this theory by going back into the Wi-Fi configuration and changing the SSID (network name) to something other than Dlink. Now, go back to your phones and check for the new network name.
Okay, thank you.