Like, you aren’t necessarily next door neighbors. You’d have to take the streetcar or bus or commuter rail some distance to go meet your friend. You can’t text “sorry the train is 30 minutes late”, because no cell phones, no internet, no tracking buses or trains on your smartphone. No payphones or landlines.
Letters are only for those cross-continental, cross-oceanic relationships. If you live in the same city, then well you’d still have to meet in person cuz it’s not the digital age, no doomscrolling social media and sending texts and memes.
I feel like those were the days where you could have true friendships in society, not “having friends to send memes”.
If you’re going that far back means those two friends in the same city were probably going to church (or some other religious gathering) fairly regularly and would likely see each other fairly often. Enough to be able to make other plans during the week. And yes, can’t tell someone you’re running late or not showing up… if you’re late you’re late, if you don’t appear then that’ll be a conversation next time at church.
Beyond that since they’re in the same city those friends likely go to the same pub(s) or other places and see each other that way.