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Are we including the standard messages/contacts/phone/camera/photo app?

If so then messages for obvious reasons.

If not then I can’t think of one as I don’t use stock apps besides the basics I’ve mentioned above.
 
Safari hands down. It’s my most favorite app by far! I’m on it all of the time researching and it really is a pleasure to use.
 
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Notes is the only one I find to be top notch. Everything else can pretty much be replaced with a better version by going with a third party app.

Not that I would need to, for things like calculator or calendar (etc.), but that doesn't make it any less true.
 
“Most used” dependa on the definition you give to it. You could define it as the amount of times it is opened per day or other unit of time. You could also define it as the number of unique users that have used the app.
 
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