I have tmobile and i did everything the instrutions said but when i put my sim card in it wont it says not supported. What should i do?

Same here.
Tried multiple ipsw version... can jailbreak, but never got SIM unlock to work.
On both OS (WinXP and MacOS).
even with the INDependence (only Mac) I coulnd't get the iPhone "freed".

HELP

guys, you seem to have different problems. A bit history of your iPhones would help us beeing albe to help you.
btw. Independence was the programm to go for with firmware 1.11 ---wayway back.

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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

Noticed that now to
QuickPWN 225
ipsw 2.2.1
->jailbreak works
Used Bootneuter (from Cydia) version 2.1
Switch connectivity off and became error that I need to restore with iTunes.


3G 16GB

I hope you did not update in iTunes to FW 2.2.1, if so you wont be able to unlock the iPhone 3G, only jailbreak and wait.

The only working way is if you are at firmware 2.2 on the iPhone, then use PwnageTool 2.2.5 to create a custom firmware 2.2.1 and apply it via iTunes. After that use Yellowsn0w to unlock....

__________________
Read the stickies and search the forum before posting!
If you want to become a Hackint0sh supporter click here
----------
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

Used the custom Version and installed YellowSn0w via Cydia.
Insert the SIM card, can ulock it... but the reception bars stay low.
No reception at all.

Are you in the USA? If so, isn't T-Mob in the USA a different type of 3G than AT&T and what the iPhone is compatible with? try switching to EDGE in network settings maybe?

Sorry if I'm off base...

Hope it all works out.