if it says the phone is UNLOCKED, then yes, you can use any sim, anywhere. If it says UNBLOCKED, then no, it has probably been nicked and hacked into, keep away from this type of phone....
If you buy an unlocked Motorola Razr 2 V9 mobile phone,you can use it with any network service provider.If it is locked,you have to unlock it from the network lock.For unlocking,you can get an unlock code from Unlocking4u.com at reasonable price and then unlock it using the unlocking instructions given for your phone from that site itself.