MacRumors reports that the Sprint CDMA iPhone 4S comes GSM-unlocked, while the Verizon CDMA iPhone 4S can be unlocked by request after 60 days.

This is welcome news to those looking to travel internationally. In those situations, customers can buy a local SIM card to use during travel, eliminating costly roaming charges.

  Sprint iPhone 4S to be SIM Unlocked, Verizon After 60 Days