There's a quote (edited for profanity, lol) from the movie Blade that really applies here:
Some mother******* are always trying to ice-skate uphill.
Truer words were never spoken when it comes to dealing with Apple's security measures. Even if you do manage to get it working, you'll be fighting a constant uphill battle against Apple's updates. Just buy an AT&T iPhone.
http://www.ijailbreak.com/iphone/unl...y-ultra-s-sim/) you can use GSM SIM cards on Sprint/Verizon phones. Unfortunately, I just bought a new 64gb "unlocked" 4s yesterday because it was a good deal, thinking it would work with my straight talk service, but having some major headaches with getting it to work. Just going to try to re-sell it without losing much $ (I hope) and get a straight AT&T model.
There have been several reports of the GEVEY sim working on ST with a 4S.
Dig deeper! It's out there!
And for all you saying it's not possible, shut up. You don't know first hand.
I can confirm its 100% possible to use a Sprint 4s on straighttalk with the gevey sim card. I paid $25 for a gevey sim on ebay, i tried it and it was authentic so i ordered one for a relative to use an AT&T on tmobile and worked. Let me know if you want to know the name of the seller.
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I can also 100% confirm this works from first hand experience. I am currently using my AT&T straight talk SIM on a Verizon 4s unlocked with the gevey ultra s. Got everything working, voice/sms/mms/data...it's probably not ideal since you'll always be behind the curve with ios updates, since you have to wait for them to figure out how to unlock the new ios version, but it does work.
Samsung Galaxy Nexus: 4.2.2 rooted with ST AT&T SIM & full Google Voice integration
If you care to switch to a US carrier look into the GEVEY or the R-SIM for your version of iPhone to unlock and use any GSM carriers.
That's how I got mine set up
The iPhone 4/4S even on the latest 5.1.1 OS works with the Gevey hardware and also the new R-Sim V. This is how I unlocked my CDMA 4S using it on Straight Talk and everything is working well. Here is a link to look up the R-SIM V: http://www.eachsupplier.com/r-sim-v-...the-world.html
The Gevey is sold from www.Applenberry.com - Many love it, but I had some issue with it, so I ordered the R-Sim 5. It came straight from Hong Kong. You have options
Hi, my name is Joey and Im addicted to cell phones...