Power — 3.7V – 4.2V

Serial port — 2.8V

Host must send “AT” first to sync baud rate. (115200 8N1, no flow control)

Scan cells around

Works without sim card installed

Switch to more verbose output that include LAC
AT+CNETSCAN=1

Perfrom scan
AT+CNETSCAN

AT+CNETSCAN
Operator:"Bee Line GSM",MCC:250,MNC:99,Rxlev:26,Cellid:A5D3,Arfcn:535,Lac:FDEC,Bsic:27
Operator:"Bee Line GSM",MCC:250,MNC:99,Rxlev:22,Cellid:9D55,Arfcn:49,Lac:FDEC,Bsic:10
Operator:"Bee Line GSM",MCC:250,MNC:99,Rxlev:20,Cellid:81CA,Arfcn:53,Lac:FDEC,Bsic:30
Operator:"MTS",MCC:250,MNC:01,Rxlev:36,Cellid:39DB,Arfcn:19,Lac:17D9,Bsic:30
Operator:"MTS",MCC:250,MNC:01,Rxlev:24,Cellid:39DE,Arfcn:872,Lac:17D9,Bsic:3C
Operator:"MTS",MCC:250,MNC:01,Rxlev:23,Cellid:0000,Arfcn:92,Lac:17D9,Bsic:1F
Operator:"MTS",MCC:250,MNC:01,Rxlev:16,Cellid:39DC,Arfcn:99,Lac:17D9,Bsic:38
Operator:"MTS",MCC:250,MNC:01,Rxlev:14,Cellid:0000,Arfcn:873,Lac:17D9,Bsic:2C
Operator:"MTS",MCC:250,MNC:01,Rxlev:20,Cellid:3977,Arfcn:23,Lac:17D8,Bsic:2A
Operator:"MegaFon",MCC:250,MNC:02,Rxlev:37,Cellid:2F49,Arfcn:114,Lac:1E3F,Bsic:33
Operator:"MegaFon",MCC:250,MNC:02,Rxlev:24,Cellid:043D,Arfcn:102,Lac:1E77,Bsic:12
Operator:"MegaFon",MCC:250,MNC:02,Rxlev:25,Cellid:2F4A,Arfcn:751,Lac:1E3F,Bsic:33
Operator:"MegaFon",MCC:250,MNC:02,Rxlev:16,Cellid:2F46,Arfcn:1020,Lac:1E3F,Bsic:33

To find coordinates of cell convert hex to decimal and use opencellid.org

  • Operator name
  • Mcc - Moblie country code
  • Mnc - Moblie network code
  • Rxlev- Signal strength
  • Cellid - Cell id
  • Arcfn - Absolute radio-frequency channel number

Set phone functionality

Minimize power consumption by set minimal phone functionality.
CNETSCAN will not work in minimal mode.

AT+CFUN=0

  • 0 — minimal functionality
  • 1 — full functionality (Default)
  • 4 — Disable transmit and receive RF

Engineering mode

Can show one neighbor cell. Works without SIM-card.
This mode is much less power consumption than AT+CNETSCAN

AT+CENG=2

Output every 5 seconds. Only one string have both cellID and LAC.

+CENG: 0,"0751,32,00,250,02,51,2f4a,05,00,1e3f,255"
+CENG: 1,"0114,33,51,250,02,1e3f"
+CENG: 2,"0757,05,05,250,02,1e3f"
+CENG: 3,"0752,09,00,,,0000"
+CENG: 4,"0000,00,00,,,0000"
+CENG: 5,"0000,00,00,,,0000"
+CENG: 6,"0000,00,00,,,0000"

Format

+CENG: nubmer,"arcfn,
	rx_level,
	rx_quality,
	MCC,
	MNC,
	base_station_identity_code(dec),
	CELL_ID(hex),
	receive_level_access_minimum,
	transmit_power_max,
	LAC(hex),
	timing_advance"

Sleep mode

Enable slow clock for sleep mode
AT+CSCLK=1

When DTR pin is high, module can etner sleep mode.
When DTR pin is low level, module can quit sleep mode.