How can I fix an Uicc unlock error message- help?

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AC Question

Uicc unlock error message- help!

Sprint unlocked my lg G3 and informed me that I have to press the uicc unlock option on my phone to complete the unlock. However, every time I try I get the same error message: network error. Please try again later. I contacted sprint and they were unable to help me and suggested I contact lg. please help!