The prompt will stop appearing. If the 611 Automatic System does not work for your carrier, you can head to your carrier‚Äôs official website if youriPhone 6s keeps asking for voicemail password. From the myWireless Account home page, select Phone/Device then choose the Reset Voice Mail PIN link from the left column. Note: If there is more than one line on the account, make sure the correct wireless number is displayed in the Wireless Number list before selecting Reset Voice Mail PIN. To reset the password for any of the lines on the account, choose a wireless number from the dropdown menu and click Submit. In a while, iPhone will display "Password Incorrect - Enter Voicemail Password." Enter the last seven digits of the wireless phone number and tap OK. Log into My Verizon with your cell phone number and password. If you've set up a username, use the username instead of your phone number. Select My Verizon> Reset Voice Mail Password. Choose your cell phone number from the drop-down menu, and thenclick on "I Will Create My Own Password." Enter and confirm your new password. Click on "Submit" to save the change. Sign in to My Sprint with your username and password. Click“My preferences” tab. Under Things I can manage online, click on Change voicemail passcode. Enter your new passcode and confirm. Tap Save and you will get a message informing you the new password has been saved.
A digital recorder is nice and all, but if you plug a recorder directly into an iPhone using a 3.5mm audio cable, you're not going to hear the call. Using the iPhone headphone jack—assuming your iPhone is so old that it even has one—cuts off the speaker. Get the Recap-C, a $99 adapter that plugs into an older iPhone's 3.5mm jack, with output to a headset as well as to a recorder. The secondary recorder—connected via a 3.5mm male-to-male auxiliary audio cable—is up to you. It could even be another iOS device (or Android or PC, but stick with the digital recorder for simplicity).

You can do so by logging in to your carrier’s website or contacting customer service for assistance. Some network providers also let you do so via their mobile app. Go to Settings → Phone → Change Voicemail Password.Enter the new password.
Go to your phone Settings and open Cellular option. Now tap on the toggle for Cellular Data option. Turning on the Cellular data; Try using your voicemail and see if the problem still exists. Method 3: Setup Your Visual Voicemail. If you are unable to set up your voicemail through phone settings, then you can try setting it up through your carrier.