When I need to concentrate, I leave my phone in another room, far away. People know that I check it when I can, but there are certain spaces where... I'm sorry, but the phone doesn't exist. In fact, with two exceptions, everything else is silent all day long and stays that way.
The hardest thing for me is when people interrupt me. It distracts me and, honestly, wastes my time. Sometimes I can't avoid it, but when I can, I do.