If I pay full price on Sprint phone, is the phone unlock or not? I know verizon, att and t-mobile device only is unlocked. How about Sprint, I know iphone 5s is locked even on full price.
Sprint's phones are locked for domestic carriers. At best they'll unlock them (I believe after 90 days) for international usage, but not for US/Domestic usage on another carrier (AT&T, T-Mobile, etc)