Still possible to use att iPhone 3GS on straight talk?

I have an AT&T iPhone 3GS with no SIM card. I have looked online and it seems straight talk is no longer offering AT&T SIM cards, only tmobile ( i really don't want to use tmobile towers!) My question is basically how do I get a SIM card for my phone that will allow me to use AT&T towers? Please be as specific as possible a link / how-to won't hurt my feelings!

I'm pretty sure you only have to do 3 things:

1. Get your phone unlocked - this will enable it to work with any SIM card not just AT&T SIM cards.AT&T probably will unlock it for free. If not google for "Unlock iPhone 3GS" or call some non-chain phone stores in your area.

2. Get a Straight Talk SIM micro SIM card - http://www.straighttalksim.com/ (they also offer the larger standard size SIM - your phone needs a mini SIM which is halfway between those, so… )

3… You may also need to get an micro-to-mini SIM adapter so that it'll fit in your phone.http://www.amazon.com/Convert-iPhone-micro-Regular-Adapter/dp/B0040WK75W/

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