It's not "more considerate" - you can ignore a phone call the same you can ignore a text. It's merely asking other people to optimize for you convenience only. That's perfectly fine to ask for, but it doesn't help with making friendships easy.
FWIW, when I do make the occasional unexpected call, I make sure to start the call with "sorry to interrupt, everyone's fine, got a sec?" or similar.
Contra the other commenter's assertion, phone calls to friends and family are typically NOT as easily ignored as texts, precisely because they're not screened. Close friends and family leave themselves open to direct contact largely to account for potential emergencies. Their phone is going to ring and/or buzz, and (for at least some number of seconds) they won't know why. During which time they might reasonably fear it's terrible news. So you're starting the interaction by having interrupted and scared them. For no good reason. Failure to understand this is maybe just a sign of immaturity. Live long enough to be on the receiving end of such calls and it'll hopefully register.
>It's merely asking other people to optimize for you convenience only.
no, it's compromise. Maybe they're free right now. maybe they are swamped all day with work or errands. Calling out of the blue is asking people to optimize for my convenience.
It's just needlessly anxiety-inducing. Not to mention it's a major inconvenience to interrupt someone randomly for a chat.