Undelete an iPhone Voicemail Message
There's no Command-Z in the Phone app, but you may be able to retrieve a deleted voicemail message: Open the Voicemail screen in the Phone app. At the bottom of the screen, tap Deleted Messages. To restore a listed message, tap it and then click Undelete.
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However, gray text in the interface usually indicates static text, which is not the case for URLs in the Firefox address bar. In the "Bug or Feature" contest this ranks as a fug (kind of a feature, but mostly a bug). Also known as a UAHSE (usability analyst's head-space error).