I bought unlock Iphone and was working fine with T-Moble sim, but I was stupid while downloading music and a windows popup so quick I can't event see waht was that, I accidently click yes and it installing something , now my Iphone only display:
_Activate iPhone
_connect to itunes
_No sim card install/Install an unlocked and valid sim to activate iPhone
And dial pad display

Help please, what can I do to unlock it again?
Thanks in advance