According to CyangenMod’s Steve Kondik, the AT&T version of the Samsung Galaxy S4 comes with a locked bootloader, which means that the AT&T version will not be the best version to get if you are intending to install custom ROM’s on the device.
I can’t see what AT&T has to possibly gain from this. GSM and LTE aren’t magical, tethering is controllable on the server side, and theft-of-services is not possible from the application processor side (or even from the modem side as far as I know). The same device is available on every carrier, so it’s not an exclusivity issue either. The modem processor has always been locked, and the casual user doesn’t want to mess with that part anyway. Samsung has always been developer-friendly, so I am guessing their hand was forced.
You can find out more details over at Steve Kondik’s Google+ page.
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