Anyone who has your cell phone number can contact you by ringing you up. However, that doesn't mean you will always want to answer. For this particular situation, or for those times when you're busy ...
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How to Set Up Voicemail on iPhone
Setting up voicemail on iPhone is easy using the Voicemail tab in the Phone app, where you can use a default or custom greeting. Access voicemail messages through the Phone app to listen, transcribe, ...
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