If i downgrade my unlocked/jailbroken iphone to 3.1.3 will it still be

Choose_The_Sword

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unlocked/jailbroken? I have a 16gb iphone 3GS and it's running on version 4.0 , its running really laggy, and sometimes i get a green screen when i try to charge.
I was wondering how i can downgrade to 3.1.3 and if doing so will the iphone still be unlocked/jailbroken? If i have to re-unlock it , can i just have it unlocked but not jailbroken? if i could also please get some links to the 3.1.3 unlocking software that would be really helpful. Thank you. Ps i have t-mobile
 
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