J-break iPhone for skype-phone

[Etan]

So my big plan to avoid the 75 dollar a month at&t BS is to:

Buy a "Go phone" and activate its unlimited data for $20 a month.

Then i thought i'd buy a 3g iphone off ebay.

Then buy a skypeIn number and buy the 3 dollars a month unlimited plan

.......

This is where my plans get fuzzy

Will I be able to use skype effectively purely as my iphone?
Which iphone should i purchase off ebay, already unlocked?
What unlocking methods should i use, what alternative apps should i download, IS THIS DO- ABLE?

I've been reading a lot of reviews and cant seem to get a straight answer, especially concerning the new OS 3.0?

Any Help would be Much Appreciated

 

[superflush]

Will I be able to use skype effectively purely as my iphone?

Do you need to have incoming calls?
You would need to background Skype to do that, and that isn't perfect even if it works.

 

[darngooddesign]

Your best bet would be to get a 3G running 2.21 as that has the best Backgrounder support.

 

[fritzov]

One of the problems with running skype in background is that skype on iphone is a real battery drainer.

 

[megamanbnmaster]

So my big plan to avoid the 75 dollar a month at&t BS is to:

Buy a "Go phone" and activate its unlimited data for $20 a month.

Then i thought i'd buy a 3g iphone off ebay.

Then buy a skypeIn number and buy the 3 dollars a month unlimited plan

.......

This is where my plans get fuzzy

Will I be able to use skype effectively purely as my iphone?
Which iphone should i purchase off ebay, already unlocked?
What unlocking methods should i use, what alternative apps should i download, IS THIS DO- ABLE?

I've been reading a lot of reviews and cant seem to get a straight answer, especially concerning the new OS 3.0?

Any Help would be Much Appreciated

There is no gophone data plan for $20 unlimited anymore.