False info!The data is on your phone. Why are you wanting to hide the app?
(The activity app on the phone can be used without the watch, in case that is the question. It's part of iOS, not watch specific. So it's like other Apple apps, I think, not hideable by default. Could always jailbreak...)
False info!
Err, which part? Please correct if you have something to add.
The data is most certainly stored on the phone. It is collected on the watch and transferred to the phone. I thought maybe OP was concerned about data being left on the watch. I think that wasn't their concern.
Doesn't the activity app store data from a bluetooth paired HR band or the new bluetooth blood pressure cuff? I suspect that is why Apple doesn't hide it when you unpair the watch, as you don't need a watch to put data in to the app, or to view the already collected data.
I don't think it does. Data from other connected devices go into the Health app, not the Activity app. So once you remove the watch, all you can do with the Activity app is to view old data. Other than that, it's useless.
The data is on your phone. Why are you wanting to hide the app?
(The activity app on the phone can be used without the watch, in case that is the question. It's part of iOS, not watch specific. So it's like other Apple apps, I think, not hideable by default. Could always jailbreak...)