How do I make my iPhone voice messages stay?

First, open the Settings app and then tap “Messages”. From there, scroll to Audio Messages and tap “Expire”. You can now set audio message to never expire. Whenever you do keep audio messages, they’ll inevitably become lost behind all the newer messages you receive.

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How do I keep voice messages forever?

If you want all audio messages to stay in your conversation forever and not expire, you can change the default settings. Go into the Settings app, tap on “Messages,” and hit “Expire” under Audio Messages. Switch from “After 2 Minutes” to “Never,” and all audio messages you send and receive will not self-destruct.