newbie help - hangs on rotation circle after ultransn0w install and hit Springboard

[JudyJudy]

Hello,
I'm a newbie and need some help.
I've done some searching and can't find exactly what my problems are.

I inherited a iPhone 3G from my brother.it's been jailbroken and has Cydia on it, how it was JB'd I don't know.
it is locked to Rogers.
I do not have the rogers SIM for it, but I do have a working Telus SIM, that I just got my plan transferred to.

I tried to unlock it yesterday, but I don't think it was successful.
after installing ultrasn0w,
it says "install complete" I press on the "Springboard," it goes into the infinite rotating circle
then I can only get out by holding the home and power button.
after a few minutes, I power back on,

when I put the Telus SIM in
gives me "Different SIM detectedd" please connect to iTunes
and will says keypad "emergency call"
I can see my network provider and the signal.... ie. says TELUS upper left-hand corner

I can't do anything else, can only go into these 2 "screens"

if I take out the SIM I can go into the settings.

version is 3.1.3
modem firmware is 5.12.1
which from readings is compatible to unlock with ultrasn0w
I have "enable 3G" on
do I need to reset "network settings"?


I've tried removing ultrasn0w and reinstalling.
also tried bypassing pressing the Springboard and doing a reboot by pressing home+power button.

any clues on where to go next?
how far away am I from using it as a phone, please?

thanks a lot!

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[JudyJudy]

added info for troubleshooting.

I just tried, I can call into the iPhone, answer it and talk and hear!
but I still can't get past the only 2 screens:
the
"Different SIM detected, please connect to iTunes"
and "emergency call" screen

it does show my provider Telus in upper left hand corner.

what step or configuration might I be missing? or need to do?

thanks!