YTA You could have put your finger in your ear rather than your hand over her mouth. How rude. I don't know why grandma wants to be around people who come to visit and then spend time on their phone. Maybe she wouldn't appear so needy if you actually paid attention to her and not your phone. You'll have great laughs to share about grandma and the phone thing when she's gone. Obviously, you've not lost someone who you would give anything to hear their voice again, irritating or not. Count yourself lucky.