: If successful, the phone displays "SIM restriction OFF". Useful Context & Safety

Connect the phone to a computer and use the tool's "Generate" button to produce an unlock code.

In the early 2010s, before the Android and iOS duopoly fully solidified, Nokia’s Series 40 (S40) devices like the (often referred to regionally as the C1-01 or C1-00) dominated the entry-level market. These devices were frequently locked to specific carriers via a "Network Control Key" (NCK) or "Service Provider Lock."

: Once the generated code is entered (using the #pw+CODE+1# sequence), the device remains unlocked even after firmware updates or factory resets.

: Unlike some software modifications, an IMEI-based unlock is typically permanent; the device remains unlocked even after factory resets or official firmware updates. Ease of Use

: Tools like these typically require you to connect the phone to a computer via a USB cable, allow the tool to detect the IMEI, and then click a "Generate" button to produce an unlock code. Common Unlock Sequence : The generated code is usually entered in the format: *#pw+UNLOCKCODE+1# symbols are accessed by repeatedly pressing the Important Considerations & Alternatives

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