I got a response from support that the message of the $5 surcharge may not apply to everyone if your phone is compatible. My OnePlus 8 shows it's VoLTE provisioned and indicates 4G when I make calls so should be good.Guess I'll wait and see.
I got the same message yesterday about being charge $5 more since my device is using 3G and doesn't support VOLTE. I got a OnePlus 8 and using LTE for data and voice as shown in the screenshot:Looks like others are in the same boat.
Got the same message as well even though my phone is a OnePlus 8 which supports 4G LTE and 5G. My voice and data is using LTE as shown by the phone info screenshot:Using LTE...If you want to check the same thing on your Android phone type this in you...