Add or Edit a Contact While On the Phone -

You know when you call someone to get someone else’s number, and they give it to you but you have nowhere to put it? You had to open up Notes to type it in, feverishly try to memorize the number and continue your conversation, or ask the person to text the number to you.

Now you can navigate to the dedicated Contacts app, and edit or add a contact while talking.

Thanks to Nate Bird for pointing this out. The inclusion of the Contacts app on iPhone 2.0 OS suddenly became a bitt less head-scratchy.