My brother just bought from his friend an iphone 3gs from his friend. The unit is from globe, and he even got the unit with the box still sealed. Now, when he turned it on using his globe sim card, the phone has a message saying something like 'please use a non-locked sim card.' he tried using other globe sim cards to no avail. we do not have any smart or sun users in the house so we have not tried it yet. Has anyone had this issue before? How was it resolved? Help please thanks!