Is it possible to change the font on iPhone Lockscreen
Yes, in the latest iOS 16, you can now customize the lock screen appearance, including font, colour, widgets, and more, according to your preference.
For more info: https://gadgetbyte.net/how-to-change-time-font-on-iphone/
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Thomas commented
Changing the font on the iPhone Lock Screen is possible with iOS customization features, but it is unrelated to resetting voicemail. Resetting voicemail on an iPhone involves changing voicemail settings through the carrier or the Phone app, whereas font changes are managed in the Lock Screen customization settings under iOS. Let me know if you need details on either topic!
https://www.techbiti.com/how-to-reset-voicemail-on-iphone/