2. Checking Your Home Phone Voicemail Call your Comcast, XFINITY, or cable phone voicemail by dialing *99. Keep in mind that this only works if you are calling from your home phone.
This iOS app does basically the same thing as the above method. It starts a call, initiates a second call, then merges the two so it can be recorded. However, instead of calls being stored in your voicemail, they’re stored in the app. Automatic Call Recorder Pro costs $4.99.

Open your Phone app. Tap Voicemail. Select Greeting. By default, your voicemail will be setup with your carrier's generic greeting. To record a custom greeting, select Custom. Tap Record to begin recording your voicemail greeting. When you finish recording, tap Stop. To make sure you're happy with your new greeting, tap Play.
Depending on what cellular provider you have and where in the world you are, the process may differ a little bit. Searches can likely be made to find the specific instructions for your specific provider. All in all, however, most of the set-ups are fairly similar and shouldn’t take very long at all. So without further ado, let’s take a look at the ways to set up your voicemail on the iPhone 6S.