By using the reset network settings, an effectiveoption to solve network related issues, you can fix allthese problems by simply resetting the networksettings of your iPhone as it will clear all the networksettings, current cellular network settings, saved Wi-Finetwork settings, Wi-Fi passwords, and VPNsettings How do you reset your voicemail greeting? From the Home screen, tap the Phone icon . Tap Voicemail then tap Greeting (upper-left). Greeting islocated in the top-left corner of screen. Tap Custom to record a greeting. Enabled when a checkmark ispresent. Tap Record to begin recording the custom greeting message. Tap Stop to end recording then tap Save. How do you change voicemail settings on iPhone? Go to the Phone app, then tap the Voicemail tab. Tap Set Up Now. Create a voicemail password, then tap Done. Enter your password again to confirm it, then tap Done. Select Custom or Default. If you choose Custom, you can recorda new greeting. Tap Done to save your greeting.
To change the voicemail greeting on your iPhone, use the steps in this help page - Visual voicemail - iPhone. Specifically -. Update your greeting. Tap Voicemail, tap Greeting, tap Custom, then tap Record. Or, to use your carrier’s generic greeting, tap Default. Thanks for using Apple Support Communities. Be well.

Hopefully, you found the interesting tips over here, to set different voicemail greetings messages on your iPhone that using Carrier like Verizon, AT&T, Sprint, T-Mobile and any other.
.To delete multiple voicemails, press and hold the first voicemail message, then “More items.”Select “Delete” then check the “I understand” box > “Delete.”How to Access Voicemail on Android?