I've been in bands since 1970 so I was organising stuff before we even had phones. You arranged a date and had to be there or else.
My 2nd band has their 3rd gig this Saturday and we've already been in touch with each other after rehearsals tonight with the absolutely wonderful private Facebook page.
My 3rd band also has a private page and the five members have all been in touch with each other today.
I'm not wasting any of my precious time with my 1st band ringing people up and texting between each other when there is already a very easy way to do it.
For this reason the 1st band is very unorganised and will never gig but I still have fun on a Mondays rehearsal.
And of course you get stuff like "Did you get my text telling you about the new Pink Floyd song we're doing?"
"Oh no, I haven't read my texts this week"