All I want are calls and text... does that work?

[JR-Fi]

I wonder if the “existing SIMs work” (and ability use non-VoLTE) could be related to:

@JR-Fi

Note, that the article says: " The company no longer allows customers to activate new 3G phones on its network (as of 2018), nor does it offer prepaid 3G service (as of 2019). " So, effectively the same, as far as any new customer is concerned.