Android phones can access voicemail by holding down the 1 key on the dial pad until the phone dials your 10-digit phone number. You will automatically connect to your mailbox and be prompted to enter your temporary password; this password is the last 4 digits of your phone number followed by the # key. Start the Google Voice app. Tap the three horizontal lines at the top left of the screen (sometimes called a hamburger menu), and then tap “Settings.” In the Voicemail section, tap “Voicemail greeting.” Tap “Record a greeting.” How do I access my voicemail? To call your voicemail on an Android phone, simply open your phone’s dial pad and hold your finger down on the “1” key. You can also call your voicemail from a different phone by calling your own number and tapping the pound key. How do you check your voicemail?
If you forget your voicemail password, you will not likely to reset it from your iPhone. You need to contact your carrier to reset your password.

iPhone recorder apps only work because they utilize 3-way conference calls, either incoming or outgoing. The third "caller" is a recording line, provided by a service from the app's developer. Obviously, 3-way calling is a must-have feature of your iPhone for this to work, so be sure your carrier supports it. In the US, the big three all do, but some smaller carriers do not—at least not in a way these apps support.
5.) Welcome to the personal mailbox from Dirk Schuster, company John Doe. Please leave message with your phone number after the tone. You will be called back as soon as possible. For urgent requests, please send an email to [email protected]. Many thanks for your call.