Step 1: Enter service mode
Step 2: Type command: AT+NBAND?.
Example output:
AT+NBAND?
+NBAND:8,20
OK
It shows your current configuration!
Step 3: If you want to check the options, type command: AT+NBAND=?
Example output:
+NBAND:(1,3,5,8,20,28)
OK
| Band Number | Frequency Range | Details |
|---|---|---|
| 1 | 2100 MHz (UL: 1920-1980 MHz, DL: 2110-2170 MHz) | Commonly used worldwide for LTE. |
| 3 | 1800 MHz (UL: 1710-1785 MHz, DL: 1805-1880 MHz) | Popular in Europe, Asia, and the Middle East. |
| 5 | 850 MHz (UL: 824-849 MHz, DL: 869-894 MHz) | Used in the Americas and parts of Asia-Pacific. |
| 8 | 900 MHz (UL: 880-915 MHz, DL: 925-960 MHz) | Widely deployed in Europe, Asia, and Oceania. |
| 20 | 800 MHz (UL: 832-862 MHz, DL: 791-821 MHz) | Europe-focused band, good for wide area coverage. |
| 28 | 700 MHz (UL: 703-748 MHz, DL: 758-803 MHz) | Used in Asia-Pacific, Oceania, and parts of Latin America. |
Step 4: How to set a band?
Command: AT+NBAND=<n>[,<n>[,<n>[…]]]
Example:
AT+NBAND=8,20
Expected output
OK
Step 5: How to set APN
Command: AT+CGDCONT=<cid>,<PDP_type>,<APN>
Example
AT+CGDCONT=1,"IP","your_apn"
Expected output
OK
Step 6: Check if the APN was set correctly given the example above?
Command: AT+CGDCONT?
Expected output
+CGDCONT: 1,"IP","your_apn","",0,0
OK
Step 7: EPS Network Registration Status
Command: AT+CEREG=1
Expected output:
OK
Step 8: Check the status
Command: AT+CEREG?
Expected output:
+CEREG:1,1
OK