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I use it as a video intercom in my house between my girlfriend and I, and will especially use it when traveling (haven't been apart from my gf since we got the phones).
 
I'm jailbroken and can use it over 3G and still never use the damn thing... It was a novelty like the first 2 weeks when me and my friends got the phone, but I havent used it since.
 
I'm in a long distance relationship and I use FaceTime almost every day. The only reason I don't use it every single day is because of the time difference, sometimes I'm too tired to wait until my boyfriend gets home from work.
 
I only used it a couple of time when my brothers got their iPod Touch 4G's. Since then I haven't bothered to use it. I even have some friends that have iPhone 4's but I don't see the point in it. I text a lot more than video chat, I think Apple should offer something like BBM but for the iPhone and it'll really take off.
 
Use it to facetime my only friend who has an iPhone 4, as it doesn't eat up our minutes, we usually dismiss the camera and just use it like speaker phone.

Have you tried "Viber" application instead? It is great and has the contact list and everything just as a normal phone application.
 
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