A:AnswerI use a Galaxy A71 with great success. As long as you can run the fit bit app and have GPS location built into the phone (which is required for syncing the data to the app) it should be fine. I have been able to use a phone as old as a Galaxy S4 with success.
A:AnswerOnly if they're looking to use the FitBit options like pedometer, heart beat, exercise tracking etc and have a smart phone to pair it to. Otherwise I'd just recommend getting a watch.
A:AnswerGreat thing about this model is that band can be replaced. There are 2 bands included - a small and a large. My wrist is 8” and I have it in the third notch of the large band, with about six notches to expand.
A:AnswerYou can change it to the date mode but there is always going to be something showing, I.e, date, or steps, or heart rate, or calories burned. I have mine set on the date. For the price it is a great fitbit. Stays charged for 5 days.