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Got some troubles with S4 sprint's Plan

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Thanks Meter 5
Posts: 172
Join Date: Sep 2008
Default Got some troubles with S4 sprint's Plan

So I bought this phone from a user on ebay, he's not using Sprint anymore so he sold it, and i'm not even in US so I just get my phone unlocked by Downgrade modem to MJA method.
But now i want a Kitkat upgrade so I got some question:
- Does my phone get sim locked If I upgrade OTA? My modem is MJA atm. After few hours reading and searching, I found that this method can;t use if above MK2.
- The owner of this phone said he already pay over 600$ for Sprint and extra fee to terminal his account. I checked my HEX number and it said the phone got clean ESN, so does it still get unlocked officially by Sprint?
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Location: Southern California
Just to answer your last question. You cannot unlock it by sprint for international unlock if you are not with them. It has to be activated with sprint in order to do that.

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