How much do Iphone or smartphone plans typically cost in japan?

I'm moving to japan in june and I definitely need a smartphone when I get out there. I won't be talking much on it. I'm more concerned about the data plan costs and less concerned about the amount of minutes used to call people.

IPhone 3G S 16GB - campaign price: 480Yen per month (11, 520Yen), regular price: 960Yen per month(23, 040Yen)
iPhone 3G S 32GB - campaign price: 960Yen per month (23, 040Yen), regular price: 1, 440Yen per month (34, 560Yen)

I'd say alot

It's usually 6000-8000 yen per month without fee to make calls. And you have to pay more if you make a call and talk.

As an iPhone 4s user with au as my service provider, I pay around 6000 yen a month for unlimited internet and a basic package. You can download the app "LINE" which probably 1 out of every 3 phone addicts use here for free texting and voice calls.

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