How to use straight talk with iphone 3gs?

Iphone 3gs is used but great shape and has been updated… I've heard you can't convert to straight talk if your iphone has been updated, is this true? I can't find any info about it on the web… Need to know though… Also what does tethered mean, something to do with internet I know but can't you use internet on iphone anyways no matter what without a hot spot because it is on your plan because with the 45 dollar plan you get data so why would you have to be by a router or hot spot? Please help no nothing about switching to straight talk on iphone but want to… Thanks again in advance

Install the mvno Atnt. At unlockit.co.nz if you try it

There's a lot of information about using the iphone on Straight Talk. Youtube has MANY videos on the subject. The best place to start is here.

http://www.howardforums.com/forumdisplay.php/551-Straight-Talk

And start reading the third "sticky" thread down from the top here:
http://www.howardforums.com/showthread.php/1691930-How-To-Straight-Talk-and-iPhone-SIM-Swap-from-Nokia-Smartphone?s=49053c8dd805b8c8b0066d6e2fe3b71d

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