How to record or change your Android voicemail greeting in 10 simple steps 1. Turn on your phone and launch the Phone app. Turn the power on for your phone. Then, tap the Phone app. 2. Open the dial pad. Tap the dial pad icon near the bottom of the screen to bring up your phone's dial pad. 3. Call your voicemail.
Open the “Settings” on your phone.Go to “Phone Apps or “System Apps” and open it.

I have a confession to make: I haven't recorded a new voicemail greeting in nearly a decade. Since then, I've (hopefully) become more articulate, poised, and self-assured. But hear my voicemail recording, and you'd think I was still new to the work world, a little unsure of myself — and probably not an authority.
Open Phone → Make sure you are on Keypad → Press and hold the number 1 for a few seconds. It will call your voicemail; You can check your voicemails here. 3. Force close and reopen the Phone app. To force close Phone, on iPhone X and later swipe up until you see the apps in task view, then swipe up again on Phone.