seeing as how you are not standing directly in front of the agent...what they are asking you would be what ANY tech would be asking you...troubleshooting steps..
Sprint has yet to hire any psychics so they must unfortunately ask you what has been done or not done so far so they can move onto the next steps that might help...or skip over certain steps because they have ALREADY been done and did not work.
I recently purchased a new Pixel 4 XL (unlocked, from Amazon), and I'm starting to notice the same problem reported in this thread. Toggling Airplane mode on and off seems to get me back out of 3G, as many others report. I'm using the eSIM on the phone, no physical SIM card.
I DM'ed @Em_Will_I_Am with my info
brc64 - I found a few steps to try and get this issue resolved.
Let's update the data profile.
From the home screen, swipe down the Status bar.
Note: The device must be in a Sprint coverage area to update the Data Profile. To verify Sprint Coverage, visit the Sprint website at coverage.sprint.com.
Tap the Settings icon.
Tap Cellular networks.
Tap Carrier settings.
Tap Update device config.
Once the update is complete, tap OK.
The data profile is now up to date.
Then I would like you to reset the network settings. The steps are:
These steps will reset the current mobile network programming. After the reset, the device will require Sprint network coverage to activate. Verify your coverage at coverage.sprint.com.
From the home screen, tap the Phone icon.
Tap the Dialpad icon.
Dial *#*#72786#*#*, then tap the Call icon.
Note: The last * will not display.
The device will power off and restart.
The network settings are now reset.
until a fix is fired out...what Juan gave is what yall get until then... a short term work around ish.