I have a LG Leon android smartphone. I have added a specific phone number to the call reject list, due to it being an 877 number. When it tries to call my phone, the phone does not ring, but they are still able to leave a voicemail (no audio, but the message is anywhere from 3 to 15 seconds of silence. Is this normal, or am I missing a setting somewhere. Not a big deal, but I am using a pay by the minute plan, so I assume each voicemail left is costing me something.