Have you checked you allowed this app to open over other apps?
Fossify Phone works perfectly on my BraX3, so pretty sure it’ll be a setting…
Don’t believe it supports it, this isn’t an iPhone after all… Also remember your Telco / Carrier has to support it, and your Phone App, and I believe the Phone itself (OS or Hardware or maybe both). So anyone of those not supporting it means you wont have it.
I also think it requires the telco to have deeper hooks into your device…
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Here in NZ our Telco’s only started supporting it last 2 years, I had it on my iPhone but nothing on my BraX3 with same Telco - I briefly used the default Phone app, but quickly switched to Fossify Phone as much better and more synergies with Fossify Contacts app. But it is a deliberately simple app… Anyway no sign of it in either…
I just use SMS notifications.
I coukd be completely srong, BUT I doubt you’ll find any privacy focussed FOSS apps that will support that visual voicemail. Read this about what notifications allow the app provider to do (and that connected voicemail is the same thing):