How do i restore an iphone 3gs back to factory settings as a new phone

help, ive got an iphone 3gs off my boss at work, ive got an orange paymonthly sim and i thought id unlocked to factory settings but this morning tis reverted back to an iphones sign with a usb cable picture, can anyone please help me at all

Go to settings>>>general>>>reset>>>erase all contents and settings
The iPhone will only work with Orange if the previous owner
1. Was also using Orange ...or
2. has had the iPhone unlocked by Orange for use on any network

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