https://en.wikipedia.org/wiki/The_Age_of_the_Pussyfoot#Joyma...
"The remote-access computer transponder called the "joymaker" is your most valuable single possession in your new life. If you can imagine a combination of telephone, credit card, alarm clock, pocket bar, reference library, and full-time secretary, you will have sketched some of the functions provided by your joymaker."
Just about the only thing today that's meaningfully different from the novel is that our devices are smaller and have screens instead of using voice as the primary input/output method. Well, and they don't have a "medical" module that can dispense drugs (yet?).
Interestingly enough, in the setting of that book, possession of a joymaker is a marker of good standing, and lack of one (e.g. because one cannot afford to pay for service) basically makes one homeless and a target for all kinds of nastiness including from the cops.