A:AnswerYou have asked a question about a SPRINT branded/carrier-assigned device. The answer if it can be GSM unlocked though is YES. This is extended by Sprint to its customers (particularly postpaid). Information on this can be reviewed here:
http://www.sprint.com/legal/unlocking_policy.html
The iPhone 5s is on the list of eligible devices for domestic and international unlocking.
A:AnswerYes it is locked. If you purchased though, you can take it in to best buy and they can unlock it and get it set up with whatever carrier you want.