Yes, but you will need a non-accepted SIM card (a SIM card from a different carrier) to prompt the phone to ask for the unlock code.
If you bought the phone second-hand and cannot access the original account information, or if US Cellular denies your request due to the account standing, you can use a paid third-party unlocking service. how to unlock a us cellular samsung galaxy s4
Regardless of the method, follow these steps to unlock your device: Yes, but you will need a non-accepted SIM
Before attempting to unlock your device, make sure: how to unlock a us cellular samsung galaxy s4