Quectel EG915U series: APN and network setup with an IoT SIM

Updated 27 October 2026

The Quectel EG915U series is a cellular module for LTE Cat-1 bis with 2G fallback. With an IoT SIM, you set the APN with AT+CGDCONT=1,"IP","<apn>", choose the radio technology, then check that the module is registered, at home or in roaming. Vendor commands come from Quectel's manuals, standard ones from 3GPP TS 27.007; each cites its document.

Key facts

Source: Quectel, EG915U series product page. Checked 27 October 2026. Quectel's AT manuals carry a confidentiality notice: we cite them by title and page, without linking the files.

Set the APN

AT+CGDCONT=1,"IP","<apn>"

For the internal TCP/IP stack, Quectel sets the APN with AT+QICSGP=1,1,"<apn>","","",0 (Quectel EC200U&EG800G&EG91xU&EG915G Series TCP(IP) Application Note V1.4, page 24).

Source: Quectel EC200U&EG800G&EG91xU&EG915G Series AT Commands Manual V1.2, page 176.

Replace <apn> with the APN shown in your M2M.global account: the internet APN, or your private APN.

Choose the radio technology

AT+QCFG="nwscanmode",3,1

0 = automatic (GSM and LTE), 1 = GSM only, 3 = LTE only. The final 1 applies the change at once.

Source: Quectel EC200U&EG800G&EG91xU&EG915G Series AT Commands Manual V1.2, pages 57 and 58.

Open the data connection

AT+QIACT=1

Activates context 1 of the internal TCP/IP stack. For the USB network adapter (ECM or RNDIS), the manual documents AT+QNETDEVCTL=1,1,1 instead (page 199).

Source: Quectel EC200U&EG800G&EG91xU&EG915G Series TCP(IP) Application Note V1.4, page 26.

Choose the USB network interface

AT+QCFG="usbnet",1

1 = ECM, 3 = RNDIS. Takes effect after a reboot.

Source: Quectel EC200U&EG800G&EG91xU&EG915G Series AT Commands Manual V1.2, page 64.

Check that it works

AT+CPIN?        SIM ready? expect +CPIN: READY
AT+CEREG?       LTE registration: stat 1 = home network, 5 = roaming
AT+COPS?        network the module is using
AT+CGDCONT?     APN actually configured
AT+QCSQ

An IoT SIM that works in many countries is often registered in roaming: +CEREG: 0,5 is a valid, working registration. Firmware that waits only for status 1 (home network) never goes online on such a SIM. Status values come from 3GPP TS 27.007; the signal command from Quectel EC200U&EG800G&EG91xU&EG915G Series AT Commands Manual V1.2, page 118.

Networks and shutdowns

• 2G fallback helps only where 2G still runs. Many operators have switched it off: see the 2G and 3G shutdown dates.
• Private delivery works with any module: the privacy is in the network path, not in the device. See private delivery.

The SIM: IoT SIM cards and IoT eSIM. All commands explained: AT commands.