Or sometimes: "Enter Restriction Code"

If you’ve recently dug out your old Nokia C1-01 from a drawer—perhaps to use as a backup emergency phone, a music player, or just for a hit of Snake nostalgia—you might have hit a frustrating wall. You power it on, insert a SIM card, and suddenly the screen freezes with a dreaded message:

This does not work for SIM network locks (carrier locks). Only for security settings turned on within the phone.

Call your old carrier. If the phone is paid off, they will give you a Network Unlock Code (NCK) for free. The quick solution: Search eBay or Amazon for "Nokia C1-01 unlock code." For about $2–$5, you can buy a permanent code based on your phone's IMEI number.

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