[LG V60 ThinQ Guides, News, & Discussion] obana01:
This is a simplified way to enable VoLTE for LG V60 ATT (LMV600AM) phone. It's based on the more sophisticated guide here: https://xdaforums.com/t/lg-phones-g...all-carriers-unlisted-countries-also.4575655/

Many thanks to johndaniel for the thread above. I followed that guide with my V60 ATT Android 13 ver. V600AM40f but unfortunately VoLTE mode was not enabled after those steps. I played with different settings in IMS hidden menu and found a way to enable it. So I'm sharing my positive experience. It's a shame for AT&T as this particular phone is still locked with ATT but I couldn't call and get calls with ATT prepaid sim card and ATT guys couldn't help me to fix it.

1. Enter on phone dial pad: *#546368#*600#

It should open the hidden engineering menu, go to Field Test submenu.

2. Go to GPRI VoLTE/VoWIFi (this menu is in Field Test list on V60 ATT model, note this step corresponds to 4.3 in the guide above)

Go to IMS, then "Slot - 0 : ATT / US" (that was a single menu item in LG IMS menu on my phone)

Now you should be in "GPRI VoLTE/VoWIFi" menu

Enable VoLTE, ViLTE,VoWIFI,VIWIFI items (they all were enabled in my case)

I didn't change other settings in this menu but I think there are many VoLTE related items you may check and play with in case of troubles, for ex. "SMS over IMS", Call/VoLTE, Call/VoWiFi, Ut/XCAP submenu with "Ut/XCAP Enabled" and "Ut in non-LTE" - they all were enabled in my phone.

3. Press Back button 3 times to return to "Field Test" menu from "GPRI VoLTE/VoWIFi"

Press "IMS Setting" in "Field Test" menu, then press "Slot - 0 : ATT / US" in LG IMS menu

4. Now you should be in IMS Setting menu, go into the following submenus here:

4.1 Under Subscriber enable IMS,ISIM, USIM items.

And be sure to enable "Test Mode" (that was my critical point to enable VoLTE on this phone)

4.2 Under Xcap\Ut. In General section: enable UT, USSD Over IMS

In ETC section: enable 'Check IMS Registration', 'Use rule-ID from response', 'Query on bootup'

4.4. Under Test. (I keep the same step number with the guide above for reference)

I played with empty field or "ATT" for Preference Operator and with empty or "US" for

Preference Country - it made no difference in my case, so I left those fields empty.

Enable these items: 'Support Volte AT command', VoNR, 'UAC Enabled', 'VoLTE Setting Enabled'

Enable "Show Icon" item if you want to have a service icon VoLTE or Wifi /SMS in the left part of the notification bar and a special item in the phone notification list. It reads Connected:uc.sms.uc_wifi. on my phone with sim card and connected. You can press on that notification and it will open IMS Setting service menu without that pass-code *#...#* from dial pad - so it's much easier to restart IMS via Test/ Restart IMS process if needed.

4.5. Press Restart IMS process in the Test menu and wait for 1 min or so, see if the VoLTE icon shows up in the top right part of notification bar. And if you enabled Show Icon in point 4.4 the service icon in the left part will change too.

And that's it. I played with step 5 and 6 from the guide above and found they are not needed for this phone configuration.