Regarding i850
You can visit a Sprint/Nextel repair center and assuming they have the equipment and programs. They can hook your phone up to their computer and read the phone's info which gives the unlock code. However, there is a chance that the subsidy lock can not be removed due to software or incorrect sim cards. If you or someone else has used a Boost sim card for the i850, this could have caused the issue, therefore it can not be fixed.
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