printer wont connect

This works! Just to clarify:

From the T-Mobile Internet app, choose RED at the bottom.

This takes you to the "Manage your Wi-Fi networks" page. Click on the plus sign at the bottom.

This takes you to "Update network." Under Wi-Fi network name (SSID)" write the name of a new network (your choice).

Next line, set a password.

Under “Frequency band” choose “2.4 GHz”;

under “WPA Version” choose “WPA/WPA2”. 

This will automatically set the next box "WPA Encryption Mode" to TKIP & AES. That's fine. Don't change it.

Click SAVE.

That does it. Hopefully it will work as well for you as for me.

Ran into the same issue. Printer wouldn't connect.. created the new network at 2.4… but now the question is… can I only print if my device is connected to the 2.4 network? I can't print from the faster original network can I?

Bukover rules!!!  My HP Office Jet 4630 now prints on the new 2.4Ghz frequency network I set up. Just tap the plus sign (+) on the T-Mobile Internet app "Manage your Wi-Fi networks" page to set up the second network.

The Cannon 452 should work on a separate 2.4 GHz SSID. Either add an additional SSID on the 2.4 GHZ radio or separate the current one and change the name/SSID to reflect the difference. 

Built-in wireless LAN (IEEE 802.11b/g/n)

If you don't like that solution or have issues with it add another router or an extender. The 803.11ax of these gateways doesn't play well with the older tech. Some might argue the older printers do not play nice with the newer 802.11ax. It is still the same problem. Compatibilidad 

follow Bukover’s advice!! It worked!!

Bukover has the literal only solution to this! Finally, after four hours of pulling my hair out! ¡¡¡¡Gracias!!!!

Thank you bukover and anabanana!  Your advice worked perfectly. My HP printer is now operational thanks to your tips. I had spent over an hour on the phone with T-Mobile support trying to get my printer to connect to the wireless network. The support team were very nice and tried everything but unfortunately it did not resolve the problem.  I realized that because my printer is an older model, it will only work on a 2.4Ghz frequency.  Thank you again!

Thank u bukover! I have an older printer. I couldn't figure out why it would not connect to wifi sometimes. I did exactly what you said and it worked! Nuevamente, gracias.

I ended up buying a cheap router from Amazon to test. It's tplink brand or something. $25 if anyone wants the exact one let me know but you'd probably be better off with a mid/higher priced router. It was incredibly easy, I just plugged the ethernet port into the back of the kdv21. You can hook up any of the devices that you don't need to print from to the regular tmoble modem of you prefer and whatever you use to print hook up through the router but it doesn't matter you can hook everything up through the router. I would recommend Linksys or another reputable brand, I've had two Netgear combo modem routers (cheap and very expensive) and their customer service stinks.