From the Skype for Business desktop app (if you are running Click-2-Run build C2R 8201.1002 or later), select Set Up Voice Mail. Change your Call Answering Rules You can change what options your callers have when they reach the voicemail service; get disconnected, hear your greeting, record a message, choose to be transferred to the number or user you select. Change your prompt language This is the prompt language that is played to callers. For list of supported languages, see Languages for voicemail greetings and messages from Skype for Business. Configure your Out of Office greeting This is the customized greeting message that is played to callers when your status is Out of Office. This option can be activated "Always," when you have an active "Auto Reply" in Outlook, or whenever you have an out-of-office calendar appointment.  Where you can get your voicemail messages from
First I would check the phone to see if it saved the greeting to its files. Some phones do and some don’t. If you are unable to find the voicemail greeting file, google the question for your type of phone. If you’re unable to find it or do it, call youe cell phone carrier to see if they can help. Some carriers still save voicemail greetings on their systems. It’s a great reminder though that if you have a greeting you really want to keep, to make sure you record it and save it to your computer and to a flash drive or cloud drive for good measure. Hope that helps! Laura

«The phone rang in Clark Taylor's house at nearly three in the morning. He answered it only after the FIFTH ring. Although nearly ten years had passed since THEIR last meeting, Clark was able to recognize the voice. It belonged to Martin Hall, one of the BRIGHTEST math students he had ever had.
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. On iPhone 8 and earlier double press the home button, then swipe up on Phone. You will see all the open app cards.