It’s not Apple’s fault, actually.
Contrary to my belief for years, Apple doesn’t control your voicemail box. If they did, I’m sure it wouldn’t get full without at least notifying you, or raising your storage limit.
But instead your service provider controls the voicemail box and lets it get full after 30 minutes of audio (approximately 50MB of data or .07% of a 64 GB device). And then when an important contact calls they hear a message saying the voicemail box is full and you receive no notification until a kind soul tells you.
Instead of improving this core product feature that causes real problems for real people, Verizon is out here making a cloud storage service and texting me about it.
What problem is this solving for anyone? Between iCloud, Dropbox and Google Photos are people still searching for a better solution? And when they search for that solution, is Verizon the one you would turn to?
Anyways. Verizon is why your voicemail box is secretly full and they are too busy build a cloud storage platform that no one wants to fix the core function and receiving phone calls.