Accessing voicemail on an Android phone can be achieved by hitting and holding down the 1 key on the number pad until the system dials your 10-digit phone number, as seen in the screenshot.
You can play a voice message at different speeds and pause/resume the message, using desktop client visual voicemail, or by dialing into their voicemail. Pressing a certain key on your phone controls how you can hear the voicemail: Read your voicemail transcription

After setting the number on your voicemail, you must also record a personal voicemail greeting. Follow the steps below. Start the Phone app. if you don’t see the numeric keypad, tap “Keypad” at the bottom of the screen. Tap and hold the “1” for about two seconds until the phone automatically calls voicemail. Immediately tap “3” to access voicemail settings. Listen to the options. On most voicemail systems, tap “2” to start the process to record a new greeting. The current personal greeting will play; then tap “2” again to record a new greeting. Say the greeting you want, and tap “#” when you’re done. To save the greeting, tap “1.” The personal voicemail greeting has been set. Hangup the phone. How to setup voicemail using a Visual Voicemail Applications
To access voicemail from another line, call the phone number, let it ring till it goes to VM, then interrupt the greeting by pressing * and entering the PIN. You can also call 8056377243 > press * > enter 10 digit phone number > enter PIN to access your voicemail.