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For network/SIM locks, the most reliable and legal way is to contact your original service provider . Most carriers will provide an unlock code for free if the device is paid off.

Sony provides a dedicated Bootloader Unlock service for developers. You can check eligibility by dialing *#*#7378423#*#* and navigating to Service info > Configuration > Rooting Status . For network/SIM locks, the most reliable and legal

If you are a technician, tools like UnlockTool are widely used in the industry but require a paid subscription and specialized knowledge to avoid bricking the device. Comparison of Methods Carrier Request SIM/Network Unlocking Sony Developer Portal Bootloader Unlocking (Devs) Xperia Companion Forgotten Screen Locks (Data Loss) S1Tool / SETool Unofficial Legacy/Technical Repairs For network/SIM locks