(REQ) change or repair Samsung Galaxy S4 (SPH-L720T) Sprint

hello,



good day gurus. this is my first post here though it's coming as a question.







please i was enable to unlock Samsung Galaxy S4 (SPH-L720T) Sprint but i am concern about change or repair imei of my phone.



the reason is because changing to blackberry imei make internet very cheap in my country, not any illegal means.



can i achieve this without box?



if not, which box should you recommend.



thanks alot

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