Open your phone dialer. Type *#*#83781#*#* or *#*#3646633#*#* . The screen will refresh into a specialized system menu. Step 2: Navigate to Connectivity Settings
Cellular networks track hardware signatures. Mismatched or duplicated identifiers will trigger automatic network bans, rendering the device permanently blacklisted from cellular towers.
An invalid, null, or lost IMEI (International Mobile Equipment Identity) number is a common issue on Android phones powered by Spreadtrum (SPD) or UNISOC chipsets, often resulting in a "No Service" status. If your phone cannot make calls or use mobile data, you may need to repair the IMEI. spd android imei repair code
For more advanced users with rooted devices, terminal emulators can be used to send direct commands to the modem: AT+EGMR=1,7,"YOUR_IMEI_NUMBER" AT+EGMR=1,10,"YOUR_IMEI_NUMBER" Stack Overflow 3. WriteIMEI Tool (PC Method)
For stubborn devices or newer Unisoc processors with enhanced security layers, standard tools might give an error. Professional multi-tool software can bypass these restrictions. Popular compatible service tools include: Open your phone dialer
The tool is configured to look for the device's diagnostic interface (usually via a specified COM port or USB selection).
: Often used for Infinix, Tecno, and Itel devices to fix "Invalid IMEI" issues. Step 2: Navigate to Connectivity Settings Cellular networks
Click . Power off your phone, hold the Volume Down key, and connect it to the PC via USB.
If the repair "succeeds" but you still have no signal, try a factory reset from settings.
To access the hidden configuration menu, open your device's stock phone dialer and input one of the following sequences exactly as shown. The menu should launch automatically upon entering the final character. Primary Engineering Codes
I can provide the exact or step-by-step instructions tailored to your device. Share public link