How do you manage your clients contacts?

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I am a private English tutor. I have potential clients calling me frequently. I try to save their number in my phone under some sort of name that helps me remember who they are and why they called. I don't always have time to do that . Also I have so many multiple names, I can't keep them all straight. Plus now I have years of accumulated numbers .

I want an app in my android that allows me to easily save numbers I've made or received in a special group for potential clients. I want to see at a glance all our call history as well as any notes .

The stock Google/htc phone book ain't cutting it.

What do you use?

EDIT: emphasis on app for my android phone

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