iphone with data only plan?

I want to ask if anyone has use this before.

I want to buy iphone without plan. then buy a 3G modem plan with unlimited data (e.g 3's $188/month).  I use Skype most of the time, and can use VOIP on iphone.

does this work? then 188/month i have unlimted data and cell phone minutes.?

also, anyone know if 3's or CSL's next G support tethering with iphone?

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3G modem plan??
可能用到,不過唔會打到電話

CSL's next G 唔 support tethering

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why not? i am not using the telecom provider. i am using Skype which is thru VOIP

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as i know skype works with wifi only.
it supports 3g network now?

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