Our oldest is in college and it still takes some getting used to.
When I went to college we had a phone in our room but had to use a calling card or call collect. And the internet wasn't really a thing. Needless to say I did not have many conversations with my parents.
I told oldest I would like one proof of life text a week and he has been pretty good about it. And I have been pretty good about letting him be the one to contact me. Baby steps to independence. (just realized the irony and poignancy of that phrase. May be the seed of a poem.)
Today I am thankful for the technology that allows me to keep in touch with my kids and they with me.