Most voicemail systems, probably even the one you use, don’t store voicemail locally (on your phone). When you miss a call it’s forwarded away to a computer server and the message is stored there. To access them your mobile carrier will tell you to call your voicemail inbox where you can listen, replay and delete your messages.
It’s also not uncommon for the servers to have storage time limits, which means your voicemail messages are deleted after a period of time. Different voicemail systems around the world usually work in a similar way, but if your unsure about anything, you should contact your mobile service provider or voicemail app customer service team.
Similarly, applications like Vxt store your voicemail off-phone, on a computer server somewhere. The benefit of doing it this way is that if anything happens to your phone, your information is safe and it saves space on your phone for other things. The only time voicemails are deleted from our storage is when you delete them yourself. These applications are different in that you can generally forward your messages to your email or have them sent as a text to your phone. In this way you can make sure your voicemails are saved indefinitely, whether to keep as business records or maybe you just want to save a loved ones voice for the future.
However, apps aren’t generally able to save or import voicemail retroactively. That is, if a voicemail was left before you started using a voicemail app, the app won't be able to access it.
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