hasn't been registered to orange yet? Just bought an orange sagem phone but i don't want it on Orange, i'd rather it be on T-mobile. This phone was not on T-mobile so don't ask why i bought it on Orange because the phone was only on Orange 
So would i be able to put a new T-mobile sim card in a none registered Orange phone? Or would it still lock it because it is somehow registered with Orange even if i haven't registered it yet?
Please help, thank you!

So would i be able to put a new T-mobile sim card in a none registered Orange phone? Or would it still lock it because it is somehow registered with Orange even if i haven't registered it yet?
Please help, thank you!