sidekick slide HELP!!!!

i just got a sidekick slide from my friend. when i put in my sim card it says i have to register it, but my friend already registered the phone for her sim card. and it will not let me register the phone for my sim. WHAT CAN I DO?!?!?

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Ok, heres the steps i took and they worked! So

WHEN I MENTION "R" OR "X" I MEAN THE LETTERS NOT THE BUTTONS ON THE SIDEKICK LIKE THE TOP RIGHT BUTTON OR THE X, Cuz ppl have had problems cuz of that simple mistake.

Step 1 start up your phone without the sim card in it
Step 2 press menu and go to setting and then go to system info
step 3 press menu shift key and X at the same time (then it will ask you are you sure you want to erase press yes)
step 4 press menu shift key and R at the same time
step 5 restart your sidekick without the sim card in by pressing 1 0 and the @ ( sim card should not have been inside to begin with) hold the R button down the phone will restart let it restart 4 times then let it go and let it boot up completely

Step 6 Insert sim card restart your phone enter user name and password and your all set

OK SO DO THESE TELL ME IF THEY WORKED AND TELL ME EXACTLY WHAT HAPPEENED "EXACTLY" !

hai..i did everythng u said buh got stuck at step 5.. i am able to restart the phone by pressing 0,1 and@,buh then when i press the R button it just doesnt restart..i restarted it manually 4 times and then inserted my sim card buh then when i turn it on it was suppose to give meh the window to enter the username and password buh it just goes str8 to the phone..heehee please HELP. btw if it makes any differnece im in new zealand and using a vodafone sim card!! thanx so much..

my friend had a similar problem with a sk3, he contacted the service provider and everything was fixed

my friend had the exact same problem when he received a phone from his friend for his birthday. he simply resolved this issue by calling the tmobile company and explaining his problems and in a matter of minutes they fixed it for him

le cambie el idioma a mi amigo sideckick 2008 y no inicia bien se queda travado que puedo hacer lo estube reiniciando y solo me aparese un circulo en la pantaya no avanza de allli
hellp my

*ORIGINAL*how to unlock a sidekick, this will work phone and txting. - YouTube

mine friend also have same problem