hi, so i went out and bought a 3g iphone from best buy (which come with 2.2.1 2.30.03) and decided to purchase a sim unlock card off of ebay which said it would unlock firmware 2.1.1 and baseband 2.30.03.

i get a SIM locked error and i'm not sure if this is because the sim unlock card is bogus or if there are additional steps i am missing.

the phone is activated, works with the att sim card, but when i put the sim unlock card with my tmobile sim, it says SIM locked. I tried entering the PKU code, but as i understand it that only works with the phone the sim card is assigned to.

my question is, will purchasing a rebel unlock sim card solve the SIM locked error?

First, welcome to the best iphone lover website.
Second/ finally, delete your thread and move it to the right section.(But be xtra carefull there are some BS selling "useless sim unlocker" there)
Here: Turbo-, Supersim and Simcloning Solution - Hackint0sh

thread moved

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iPhone 3GS factory unlocked (3.1.2; Blackra1n, Cydia, OpenSSH, custom 3.0 ipcc file (no sig), tethering hack by Dev team, 32 GB)
iPhone 3G (3.0.1; Redsn0w 0.8, Cydia, OpenSSH) 16 GB