It really depends, but ting.com/byod will tell you one way or the other. If the phone doesn't work on the Sprint network, you won't be able to bring it to the CDMA network. If it's unlocked, you might be able to bring it to our GSM network, but the S4 doesn't have LTE Band 12, so even if it is unlocked, you might not get great talk and text coverage.
an old samsung s4 from US cellular. will it work?
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