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Sony has an open policy for software developers:

     

       
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- They are releasing AOSP sources under [Sony Open Devices Program].

     

       
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- Jolla provides first-class support for installing [Sailfish OS] on select Xperias. That wouldn't be possible without Sony's openness.

     

       
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- Jolla provides first-class support for installing [Sailfish OS] on select Xperias.

     

       
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Since Sony likes to ruin a perfect thing:

     

       
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- Sony requires you to request an unlock code from [their servers][Unlock Service]. They can pull the plug anytime. You have to send your IMEI and agree to warranty voiding.

     

       
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- Sony requires you to request an unlock code from their [Unlock Service]. They can pull the plug anytime. You have to send your IMEI and agree to warranty voiding.

     

       
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Some carrier locked and US devices can never be unlocked. On Sony devices ([but not all?][service-menu-gone]) you can check if the bootloader is unlockable using the service menu.

     

       
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1. Dial `*#*#7378423#*#*` in the dialer.

     

       
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2. Tap "Service Info", then "Configuration", then "Rooting Status".

     

       
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3. Under Rooting Status look for "Bootloader unlock allowed"

     

       
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4. If "Yes", then the device is unlockable.

     

       
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***

     

       
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Additional info provided by [K4sum1](https://github.com/K4sum1).<br/>

     

       
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Authored by [konradmb](https://github.com/konradmb).

     

       
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[Sony Open Devices Program]:https://developer.sony.com/open-source/aosp-on-xperia-open-devices

     

       
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[Sailfish OS]:https://shop.jolla.com/

     

       
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[Unlock Service]:https://developer.sony.com/open-source/aosp-on-xperia-open-devices/get-started/unlock-bootloader
     

       
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[Unlock Service]:https://developer.sony.com/open-source/aosp-on-xperia-open-devices/get-started/unlock-bootloader

     

       
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[service-menu-gone]:https://www.reddit.com/r/SonyXperia/comments/qir0ze/what_happened_to_the_service_menu/