I have the $15/month prepaid plan (unlimited texts, 100 Canada minutes, and 250 MB) on my iPhone 11 (model A2111) running iOS 17.4.1. (I just changed to that plan today from an older form of $15/month that didn’t include the minutes.) I understand that in order to be certain that the US roaming boosters will work when I travel to the States next month, I need to have VoLTE activated. The support chatbot says that as of February 2023 VoLTE is being enabled for prepaid customers, but I’ve been a prepaid customer for more than ten years, and I still don’t have it. When I go to Settings --> Cellular → Cellular Data Options → Voice and Data, the only two options shown are LTE (which is selected) and 3G. I have tried resetting my voicemail PIN, but that didn’t help. How can I get VoLTE enabled on my line?