3. Activate or deactivate One-Touch Access. When you call your voicemail from your phone from anywhere on the Nationwide Sprint® Network, One-Touch Access allows you to access your voicemail without having to enter your passcode.
If it is the first time you are using the Voicemail, you should set up or change your default voicemail on iPhone 7 first. If you have set up the voicemail, you can skip to next part. Or else, you can get some helpful information to set up voicemail. As different carriers may have different ways to set up voicemail on iPhone, the part just take AT&T for an example.

(feature not active now) 7 –Delete all messages 8 – Change your passcode 8 – Modify message deposit settings 9 – Exit the Voice Portal * – Voice portal # – Repeat the menu # – Repeat menu Retrieving and Handling Your Voice Mail Messages Access the voice portal from your desk phone or other phone
It works similar to the old answering machine, with the only difference is that the old answering machine will store the voice message in the machine itself, while your phone’s voicemail system will store the voicemail in your service provider server. You can also forward the voicemail message to someone else’s mailbox.