Code-based unlocking is the cheapest route in this catalogue and the one with the most ways to go wrong. This page covers the whole code family: what NCK, MCK, RGCK and SPCK actually free, which brands and years still use codes at all, and the four mistakes that account for most failed orders.
An NCK is the network unlock code, derived from the IMEI by the operator's database. MCK frees a sub-network (provider) lock, RGCK a regional lock, SPCK a service-provider lock. On a handset that still prompts, entering the right code writes the unlock into non-volatile memory: it survives a factory reset and does not trip Knox.
Since roughly 2020 most flagship Samsungs and all US carrier variants no longer prompt at all — they are server-side locked and need a carrier release, not a code. Sending a code order for one of those fails every time.
The free route fails for one of four reasons, and only the last one needs money: the device is still financed; the account was closed with a balance; the buyer is not the account holder; or the IMEI is reported. Everything else is a paperwork problem the carrier can fix.
The code services in this catalogue are priced from a couple of dollars and refunded when no code can be generated for a covered model. Every problem on this page is diagnosable before you buy a second code — the region check and the model list are there for that.
| Service | Price | Covers |
|---|---|---|
| Motorola Unlock Code NCK Instant | $0.25 | Motorola |
| Acer Unlock Code NCK - No Verification「Test」 | $1.50 | Acer |
| FNB Unlock Code NCK - Check Supported Model | $3 | FNB |
| HTC Unlock Code NCK - 2009 ~ 2018 New Database | $3.50 | HTC |
| Canada Freedom Unlock Code | $7 | Samsung · Canada |
| HTC Unlock Code - Not Found | $7 | HTC |
| Doro Unlock Code Calculator No Verifications/Refunds | $9.90 | Doro |
| Samsung Canada Unlock Code NCK + MCK - Bell, Telus & More | $11 | Samsung · Bell · Canada |
| LG Unlock Code 2021 | $12 | LG |
| Canada Samsung Open Canada Unlock Code NCK + MCK - All Models | $15 | Samsung · Canada |
| Emporia Unlock Code | $19 | Emporia |
| Blackberry Unlock Code Database | $39 | BlackBerry |
| Samsung Open Mexico Unlock Code - S23/Fold 4 Series | $56 | Samsung · Mexico |
| Samsung Open Mexico Unlock Code - S24/Fold 5 Series | $59 | Samsung · Mexico |
| Samsung Open Mexico Unlock Code - S25/Fold 6 Series | $67 | Samsung · Mexico |
15 services in this guide. Prices are live; sign in for volume pricing.
Insert a foreign SIM and wait for the "SIM network unlock PIN" prompt.
Wrong region, wrong code type, uncovered model, or a phone that is not code-locked.
No.
Usually five to ten.
Samsung mid-range and older models, HTC, Kyocera, Tecno, itel, Lanix, Azumi, Hisense, Alcatel, Mobicel and similar.
Last checked 2026-10-28. Carrier rules are summarised from the operators’ own pages; where a rule has changed since, the operator’s page wins.