Samsung KG Lock Check: How to Read the Knox Guard State
KG is a remote lock set by whoever sold the phone on credit. It is read on the phone, not from the IMEI. Here is how, and what each state means for a buyer.
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What KG (Knox Guard) is, in plain words
Knox Guard is a Samsung service for sellers who hand over a phone before it is fully paid for. A shop, a lender or a carrier enrols the phone's identity in Samsung's system, and from then on they can lock it from a web console. That is why you see it most on phones sold in instalments, in markets where buying a phone on credit is common, and on trade-ins from those sales.
The idea is fair for the seller. The risk is yours if you buy second-hand: the lock follows the phone, not the person, and a phone can look perfect on the day of sale and lock a month later when the first owner stops paying. That delayed lock is the pattern to be afraid of, and it is why the check below matters more than the cosmetic condition.
How to read the KG state on the phone
- Switch the phone off and keep it off for a few seconds.
- Hold Volume Up and Volume Down together and, while holding them, plug in a USB cable connected to a computer. On some models the combination differs slightly, so if that does nothing search for your model name plus "Download mode".
- A blue warning screen appears. Press Volume Up once to continue into Download mode.
- Read the small text at the top left. Look for a line starting KG STATE (older software labels it KG Status).
- Hold the power and volume-down keys to leave Download mode and restart. Nothing is changed by looking.
Do not press any key on the Download mode screen other than the ones above, and never accept a prompt to flash anything. Reading the line is all you need.
The KG states and what to do about each
| KG state shown | What it usually means | Buying advice |
|---|---|---|
| Active | Enrolled and unlocked. The enroller can lock it at any time. | Do not buy used unless the seller can show the phone is fully paid and the enroller has released it. |
| Locked | The enroller has locked the phone, usually after a missed payment. | Do not buy. Only the enroller can unlock it. |
| Prenormal | Enrolment started but not completed, common on a phone fresh from the box. | On a new phone, take it back to the shop for completion. On a used one, treat it as Active. |
| Completed | The payment plan finished and the enroller released the phone. | Good. This is the state you want on a used phone sold on credit. |
| Checking | The phone is asking Samsung for its state, often on first start with no network. | Connect to Wi-Fi, restart and look again. |
The wording on screen can differ between software versions; the table lists the states Samsung's own documentation names. Where a screen shows something else, trust the screen over this page and ask the seller to explain it.
What we can check, and what we cannot
Our box above returns three things for a Samsung IMEI: the model the number belongs to, whether the answering carrier databases flag it as blacklisted, and its carrier lock state. It does not read the KG state, because that lives in Samsung's enrolment system and is shown only on the phone. We say so rather than paint a green tick on something we could not see.
So the routine for a used Samsung is two checks: this page's box for blacklist and carrier lock, and the Download mode screen for KG. A phone clean on both is a very different purchase from one clean on only one. If the seller will not let you boot Download mode in front of you, that tells you what you need to know.
If you already own a phone that is KG Locked, the way out is the shop or lender named on your receipt or contract. Ask them to release it in their console; if they have closed, Samsung support can tell you who the enroller was but will not remove the lock for someone who cannot prove it is theirs. See also the guide to locks on financed phones.
Questions people ask
What does KG Locked mean on a Samsung?
KG stands for Knox Guard, a Samsung service that lets the party who enrolled the phone, usually a retailer or a lender selling on instalments, lock it from afar. "Locked" means that party has switched the lock on, typically because a payment is overdue. The screen then shows a message and the phone is unusable until they release it.
Can I see the KG state with just the IMEI?
Not from a public free page. The enrolment record sits in the Knox Guard console of whoever enrolled the phone. The reliable way to read the state is on the phone itself, in Download mode, as described above. If someone claims to check it by IMEI for a fee, ask what they are reading from.
The state says Prenormal. Is that bad?
It means the phone is enrolled but the enrolment has not been completed. On a phone you bought new from a reputable shop it can be a leftover from setup, and the shop can fix it. On a used phone it is a warning: the previous holder may still be able to lock it. Ask the seller to prove the phone is paid off and to get the enroller to release it before you pay.
Can a KG lock be removed by a repair shop?
The only clean release is the one made by the enroller in their console. Services that promise to strip it for a fee either rely on a short-lived software flaw, can brick the phone, or are fraud. A bypassed phone can lock again after an update. Do not pay for one as a buyer, and do not buy a phone sold as "KG removed".
Is KG the same as a carrier lock?
No. A carrier or SIM lock stops the phone using other networks; Knox Guard can stop the phone being used at all. A phone can have one, both or neither. Check the lock line in the results box above for the carrier side.
Does a factory reset clear Knox Guard?
No. The enrolment is tied to the device identity and is restored after a reset, which is the point of the feature. Resetting a locked phone gets you back to the same lock message.