I have a pre-unlock era smartphone. Carrier is Softbank, and maker is Kyocera. Model is 202K (Digno).
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I want to use this phone for YMobile.
Even though YMobile is owned by Softbank, I cannot use that phone with YMobile sim, I must get the phone unlocked.
I know this can be done, because in the past I have used that exact model in YMobile network. I had bought 3 phones, and used them, and later sold them. Because once I had them, the screen looked smaller, so I went for bigger screen.
But now I regret, and want to use that model again. This is because it is one of the lightest 4.3" smartphones ever created, at just 94 grams!
I am tired of carrying heavier smartphones.
I can still buy this model at Yahoo (Japan) auction site, for between 1000 yen ~ 3000 yen.
The (original) carrier (Softbank) won't unlock it because it is pre- unlock era phone.
(I think the Japanese carriers made unlock option available to customers only for the phone made in 2014 or 2015 and later... I need to google for exact date, but you get the picture.)
Can someone give me some hints how do I go about it if I do it myself? I am sure the techniques are there, I just don't know how to get started.
When I google, all pages show that information- that one ask the carrier to do the unlocking.
There are some sites (that would generate unlock code when I put IMEI), but they don't list that phone model to begin with.
So I am looking for expert advice how to generate my own carrier unlock code.
I found this:
In most cases unlock codes are generated by an algorithm that takes IMEI of the specific device and carrier information and created the unlock code specific to that device locked to a certain carrier. These are usually generated by the carrier using software from the hardware vendor or by the hardware vendors. Third party unlocks are usually generated by software that has cracked the lock/unlock algorithm for a specific device or class/family of devices. This is why you generally need to provide your IMEI and carrier (and model) to the unlockers. They enter that into info the software and generate the same unlock code that your carrier would generate.