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.
Tap "Call Settings," and then tap "VoicemailSettings." Tap "Voicemail Number." Type the voicemailnumber into the box or edit the existing voicemailnumber. Tap "OK" to save your changes. How do you check your voicemail from a different phone? Call your 10-digit wireless number. When you hear your voicemail greeting, press the * key tointerrupt it. If you reach the main voicemail system greeting, enter your10-digit wireless phone number, then interrupt your greeting bypressing the * key. Why is my voicemail unavailable on my iPhone?

Retrieving voicemail messages. Users can listen to voicemail messages by accessing Nextiva Voice mailbox from a Nextiva phone or external phone. If calling from the primary phone, dial *86, otherwise if calling from any external phone, dial the phone number and press the * key during the voicemail greeting.
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