[ivv]

I'd select 10 random users who abandoned the app and offered them $10 in Amazon ecards for 10 minutes on the phone with me. Then, I'd ask them what they had hoped for when they signed up, and what went wrong.

[akuji1993]

I think it would help to provide a questionaire form instead. People really really really don't like talking to strangers on the phone.

[skohan]

Speak for yourself. I would prefer a human interaction over a list of questions. Also you'd have more of a chance to get elaboration on things you find interesting.

[krn]

It depends on the audience the app is targeted at. If it's a geeky thing, phone calls might not work.

[briandear]

Exactly this. 80% churn means you don’t have an app (yet.) or, you have an app, but you are not positioning it correctly. You have the wrong customers basically.