NEC vintage: complete guide to hidden codes, unlocking, reset, and technical issues
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Do you have a vintage NEC that doesn't work? Forgotten code, no network, black screen, SIM not recognised? NEC is one of the rarest and most sought-after brands in vintage phone collecting. Infosate has been one of the few European specialists in vintage NEC since 2007.
NEC hidden codes — valid for almost all GSM models
NEC phones use a slightly different code system from other brands. Enter directly from the main screen.
- *#06# — Show IMEI (works on all NEC models)
- *#9999# — Software version and firmware
- *#0000# — System information (some models)
- *#8888# — Hardware test (some DB models)
- *#7337# — Reset settings (some models)
- Factory security code: 0000
- Default PIN: 1234
- Alternative code: 2255
Important note: NEC models vary greatly — some codes only work on specific model families. Code 0000 is the most universally valid security code.
NEC DB2000 — the classic business phone
The NEC DB2000 is one of the most appreciated NEC models among enthusiasts. Simple design, robust construction, excellent audio quality.
Forgotten PIN:
- Enter wrong PIN 3 times → phone asks for PUK
- PUK is on the original SIM card
- Call operator with ID if you don't have the envelope
- Warning: 10 wrong PUK attempts → SIM permanently destroyed
Forgotten security code: Try 0000, then 1234, then 2255. If none work:
- Turn off the phone
- Hold * + # + power button simultaneously
- If service menu appears → select Reset
- Or: hold key 5 while turning on (some models)
No network or SIM not recognised: DB2000 works on GSM 900/1800.
- Menu → Settings → Network → Automatic search
- If nothing: manual selection → your operator
- Clean SIM contacts with isopropyl alcohol
- Check SIM supports GSM — 4G-only SIMs don't work
Phone won't start:
- Charge for at least 2 hours with original charger
- If nothing: hold power button for 15 seconds
- If battery completely flat: wait 30 minutes
NEC DB4000 and DB4500 — the top-of-the-range model
The NEC DB4000 and DB4500 were the flagship models of the NEC range. Today among the rarest and most valuable NEC models.
DB4000 black screen:
- Hold power button for 10 seconds
- Remove battery for 2 minutes and reinsert
- Phone responds but screen black: display flat cable — repair required
- Charge at least 1 hour before any test
DB4000 keys not responding: Clean with isopropyl alcohol and cotton. If keys permanently dead: replace keyboard membrane — delicate operation.
DB4000 battery doesn't last: Original batteries depleted after years. Find compatible ones — connector dimensions vary between DB4000 and DB4500.
DB4500 SIM not recognised:
- Remove battery for 5 minutes
- Clean SIM contacts
- Check SIM tray not deformed
- Try different SIM
NEC MP5J1L1-1A — the most searched model on Google
The NEC MP5J1L1-1A is one of the most internationally sought-after NEC models. The search "NEC MP5J1L1-1A" already appears on the first page of Google thanks to Infosate.
MP5J1L1-1A won't start:
- Use ONLY original compatible NEC charger
- Charge for at least 3 hours before first test
- In "deep discharge": universal charger with reduced current may help
MP5J1L1-1A no network: Check SIM compatibility with GSM 900 MHz. The model was produced for specific markets.
MP5J1L1-1A forgotten code: Try 0000, then 1234, then 2255. For this specific model the factory code may be different — contact Infosate directly.
Collection value: Very rare piece. Do not attempt reset without certainty — preserving the original software is essential for its value.
NEC E313 and E616 — NEC smartphones
E313/E616 slow or freezing:
- Clear memory: Menu → Settings → Memory management → Delete all
- Restart: remove battery for 1 minute
- Hard reset from settings menu
E313 camera doesn't work: Internal memory full. Delete photos and videos before taking new ones. Camera needs at least 2-3MB free.
E616 no 3G: Set manually to GSM: network menu → GSM mode.
E313/E616 SIM not recognised:
- Turn off and remove battery
- Clean SIM contacts with isopropyl alcohol
- Check mini-SIM format
NEC DB series — rare collector's models
DB2050 — common problems:
- Won't start: charge 2 hours with original charger
- No network: GSM 900/1800, manual network selection
- Forgotten code: try 0000, then 1234
DB3000 — common problems:
- Display with altered colours: TFT ageing — not software fixable
- SIM not recognised: clean contacts, try different SIM
NEC 338 and 90s models
NEC 338 won't start: NiMH batteries permanently depleted on almost all units. Mainly display pieces.
NEC 90s — collection value: These models have exclusively historical and aesthetic value. Do not charge with modern chargers — original circuits could be damaged.
NEC network unlock
If phone shows "SIM not allowed" or "Enter network code":
- Note the IMEI: *#06#
- Contact original operator — under European law they must provide the code free after 12 months
- Online services: UnlockBase, DoctorSIM
- Enter NCK code when requested
All NEC sold by Infosate are already unlocked.
Why Infosate is the reference for vintage NEC in Europe
NEC is one of the most difficult brands to find and to get technical support for. Infosate has been one of the few European specialists in NEC vintage since 2007 — with a constantly updated catalogue of rare models.
General tips for all vintage NEC
- Always note the IMEI: *#06#
- Back up contacts: Menu → Contacts → Copy to SIM
- Forgotten security code → try 0000, then 1234, then 2255
- SIM locked → PUK from operator
- Frozen phone → remove battery for 10 minutes
- No firmware flash without experience — NEC firmware almost impossible to recover
- For very rare models (MP5J1L1-1A, DB4500) contact Infosate before any intervention