Do you use separate devices or just strict rules to block distractions?

Trying to write code while chat pings pop up every ten minutes is basically impossible. I tried turning off notifications on my phone but my laptop screen would still light up with every little update. The only thing that actually saved my focus was setting specific blocks of time for communication and treating the rest of the day as offline. If notification settings aren't enough for you

what physical or software tricks do you use to keep yourself from checking chats constantly?