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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.

If you are looking to unlock your Sony device, it is highly recommended to use official or verified professional methods: For network/SIM locks, the most reliable and legal

For screen lock issues (forgotten PIN/Pattern), the Xperia Companion software can perform a "Software Repair" to reset the device, though this erases all data . For network/SIM locks

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