How to verify an unlockable bootloader of XA2

I am not sure how to check bootloader unlocking capabilities from within android, but I am also not sure about the use case. Unless you buy a used phone, you won't have the chance to figure it out. Though, you can still return it within 2 weeks if you don't like it (cannot unlock it ) right? Moreover, I got a XA2 from O2 in Germany and it's working perfectly with SFOS3. No bootloader unlocking or flashing issues whatsoever.

I let myself be told that the bootloader locking is in the behest of certain operators that have their own specific tweaks to the standard ROM. If you don't buy the device from an operator (or a used device that was bought from one) you probably should get an unlockable device.

Hack the IMEI into the Sony open device page and it will tell you?

I think if you post the IMEI to the Sony site to get the unlock code, that constitutes the act of unlocking and the device is from then on considered unlocked.

The physical box does have a bar code sticker with the IMEI(s) on it if you get your hands on one, but there's no online test for the unlockability on the Sony site I think.

Did you already try the same method as for X? I thought XA2 also has service menu? Also, just entering your info in Sony site won't do anything to your phone. It will just tell you if it can be unlocked, and give instructions.

I don't know if there is another place for entering your info on the Sony site for unlockability check, but if you:

1) by the instructions go to https://developer.sony.com/develop/open-devices/get-started/unlock-bootloader/#unlock-code , and

2) select your device "Xperia XA2" from the drawbox at the end of the page,

you are asked to click check on two boxes regarding warranty issues before you can proceed to get the Unlock Code.

This obviously will not actually do anything to your physical phone. BUT, going through this action very likely will mark your IMEI as unlocked bootloader for warranty purposes as far as Sony is concerned.

The installation instructions at https://jolla.com/sailfishx-linux-instructions-xa2/ does have the phases 4.1 and 4.2 for the actual act of enabling the unlocking where an internet connection is needed (and the flag for Sony can also be set), but this can be done before getting the Unlock Code and without concenting to forego your warranty, so getting the Unlock Code from Sony probably is the bit with the legal implications on your warranty, whether or not you will in the end actually use the Unlock Code you got.

Apparently it's possible to re-lock the bootloader again and claim that you never did unlock it with your Unlock Code, if you need to send it to warranty maintenance. They won't give you the benefit of the doubt to try that.

But I think service menu is the same as with X...

@Levone1 neo75 has no access to the device's service menu before buying the device, and he wants to avoid buying a device before he can be somewhat assured that the particular device he will buy can be unlocked.

Then he should contact the seller whether the device is unbranded.

https://www.io-tech.fi/artikkelit/lukijatesti-sailfish-x-sony-xperia-xa2/

A Finnish tutorial article on installing Sailfish on XA2 claims that in Sony phones available in Finland opening the bootloader is allowed by default. Devices bought from abroad can have an "operator-modified" firmware that has it prevented. The remedy in that case to allow unlocking is to install the firmware meant for Finland (CDA-code 1312-8563). This according to the article.

So the CDA-code probably will tell you if it's unlockable.

In my H4113 (dual SIM) the code is SI 1312-4159. The packace has a "Nordic Edition" sticker on it. Mine is unlockable.

@teemu - sorry, I missed that... Thanks