If your Android phone shows "null or unknown IMEI" or displays "not registered on network" errors, your device can't make calls, send texts, or connect to mobile data. This guide walks through fixing these issues step by step.
Understanding IMEI Numbers
Your IMEI (International Mobile Equipment Identity) is a unique 15-digit number that identifies your specific device. Carriers and manufacturers use this number to track phones if they're lost or stolen.
You can check your IMEI by opening your phone dialer and entering #06#. If you see "IMEI Null" or "000000" instead of a proper number, your device needs repair to restore network connectivity.
Fix Samsung Galaxy Null IMEI with NAS Control
This method works specifically for Samsung Galaxy devices experiencing IMEI corruption. Follow these steps carefully:
- 1.Check Current IMEI Status
- Open your dialer and enter #06#
- If you see "IMEI Null" or "000000", proceed with the repair process
- 1.Access Command Mode
- In the dialer, type #197328640# or *##197328640##**
- This opens the service menu in Command mode
- 1.Configure FTM Settings
- Select Common (usually option 6 or 5)
- Choose (FTM) Option 1 - this is Field Test Mode for debugging
- Press the Menu key (left of Home button or on-screen back button)
- Select Key input and enter 2 to turn FTM OFF
- 1.Reset Hardware Components
- Wait one minute, then remove your battery (if removable) and SIM card
- Leave them out for two minutes
- Reinsert battery but keep SIM card out
- Turn on your device
- 1.Configure NAS Control Settings
- Once booted, enter command mode again: #197328640#
- Select Debug Screen (option 1)
- Choose Phone Control (option 8)
- Click NAS control (option 3)
- Select RRC (HSDPA) (option 5)
- Choose RRC revision (option 2)
- Select HSDPA only (option 5)
- 1.Final Check
- Restart your phone
- Dial #06# to verify your IMEI number has been restored
This NAS Control method reconfigures your device's network settings to restore proper IMEI recognition and network registration. If this approach doesn't resolve your issue, you may need to explore additional troubleshooting methods or contact your device manufacturer for further assistance.
