Conclusion
: You are restricted by Docomo and must look for specialized exploits like or paid third-party cracking services. Sailfish OS Forum Important Risks Data Wipe: Any successful bootloader unlock will trigger a factory reset , erasing all user data. Security Risks: docomo unlock bootloader top
: Most docomo Xperias show "Bootloader unlock allowed: No" in the service menu ( *#*#7378423#*#* ). There is generally no official code or bypass for this. Samsung Galaxy Conclusion : You are restricted by Docomo and
Yes: You can proceed with standard Sony or OEM unlock methods. not SIM network unlock.