Like AamirZia said, OD3 has new bootloader preventing downgrades. This can also be demonstrated by people who have bought sprint phones off of ebay and people don't include the UICC SIM card that came with the device. It is basically just a 'security chip' to allow Sprint and other UICC SIM card using carriers to make sure only authentic devices are allowed to use their LTE networks. Your phone number is not saved on it, text messages aren't saved on it, contacts aren't saved on it, email addresses are not saved on it. Not only will it simply just not work unless they are using the physical linked device, but there is no information to be retrieved from it what so ever. There is no personal information stored on the UICC SIM card, so there is nothing to be gained by someone who somehow gains physical access to the SIM card. So, to answer Alex's question: you do not need to lock it, for it is already locked permanently to your device. Though, I'm pretty sure you have to get a UICC SIM from them, which unless things have changed within the last few years, I hear is kind of difficult to get from GSM carriers.
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