I use an app on my phone to help guide me through meditation. How can I minimise the likelihood that I’ll get distracted by everything else on my phone?

I have the same app that guides me through my meditation. What i do is i just let it go through, so if a call has been there i will pick it up, if there is a message i will quickly check it and continue my meditation or i start again if i want to. Usually the app mutes other notifications you can turn on “do not disturb” if you want or you can turn on the silent mode of your phone to minimize the likelihood.

Try putting your phone in airplane mode. You won’t receive any phone calls or texts unless Wi-Fi calling is enabled.
And mobil internet is also disabled, so you won’t be tempted to doom scroll. 😉