I have been having issues with the telephone part of my phone. When a call comes in the ringer sometimes does not ring but the call comes in and is logged. When this happens the ringer is turned on and the volume turned all the way up. The other issue I have been having is when you call to get your voice mail or a number that requires you to input a pin number or password my screen goes black when you attempt to type in the numbers on the key pad. I am on call 24 hours a day with the railroad so this is not a good situation for me. The last time I experienced the issues I took my phone to a Verizon corporate store where the manager investigated my phone and apps. He immediately removed the AVG antivirus app I had installed on my phone and told me that was probably the issue. He went on to say that it was not necessary to have an antivirus app on an android phone as the android operating system is an antivirus program. Since he removed the AVG app I have had no issues with my phone and the key pad now works normally. My question is: was this the problem with my phone and is this a known issue? Does this guy know what he's talking about?