Here’s various means of contact ordered by how quickly I’ll get back to you.
1. Telegram (the app, not a literal telegram)
If you have something you really want to tell me now, I recommend you choose a means of contact above this line.
4. Phone Call (Why would this be slower? Because I may be somewhere I don’t want to take a phone call, that’s why.)
If you want to be very sure I end up reading what you’re telling me, I recommend you choose a means of contact above this line.
8. Walking to the standard places I am in real life, and physically engaging in conversation, if you live in Cambridge
9. Making field art in Ingress that writes out the message you want to tell me
10. Snail mail
What about iMessage? I’m convinced more than half of those don’t successfully arrive or depart, so I don’t recommend it as a reliable means of getting to me.