Typically, in a form you could display an error if a user inputs information that is not validated.
In this video I show you how you could format a phone number on behalf of the user so they could input any numbers and symbols and not worry about whether they needed hyphens or parentheses.
Remix it!:
https://1drv.ms/u/s!AvtvG5BA8E3vj7ZxkoX3kbXM59R7dQ
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watch?v=Yf6NkPySWvc
I'm using a model driven app. Have you come up with a way to do that same thing for an Activity table leveraging business rules?