how do I block a caller from leaving a voice mail on a prepaid plan.I have a lg g2? I don't want a certin person to leave a volcemail
You might wish to take a look at Extreme Call Blocker. That app is on Playstore for already 5 years, and claims to work from Gingerbread (2.3.3) up to Lollipop. One of the explicitely listed features is:
New blocking feature: Allow the call to ring through, but prevent it from leaving voice mail.
Which should be exactly what you're after. For possible alternatives, be welcome to take a look at my list of Call Blocker apps.