Dialing a phone number with actual digits accounts for maybe 1/500th of the use of my phone. That may not be common, but I don't think dialing digits is "the task at hand" for a phone anymore.
In fact, Apple's iPhone integration spans so far that I rarely even enter contacts on my phone anymore:
1. Someone emails me their phone number.
2. I mouse over it in Mail.app, click 'Create New Contact'.
3. I click 'Add to Address Book'
...
4. That's it. There's nothing else. Their name and email address get filled in automagically from the email, and within a few minutes the contact gets synced over the air to my phone.
In fact, Apple's iPhone integration spans so far that I rarely even enter contacts on my phone anymore:
1. Someone emails me their phone number.
2. I mouse over it in Mail.app, click 'Create New Contact'.
3. I click 'Add to Address Book'
...
4. That's it. There's nothing else. Their name and email address get filled in automagically from the email, and within a few minutes the contact gets synced over the air to my phone.