SIMCom A7670 series: APN and network setup with an IoT SIM

Updated 27 October 2026

The SIMCom A7670 series is a cellular module for LTE Cat-1 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 SIMCom's manuals, standard ones from 3GPP TS 27.007; each cites its document.

Key facts

Source: SIMCom, A7670 series product page. Checked 27 October 2026. SIMCom's manuals require a login on simcom.com: we read SIMCom's own documents in the versions named, which may be older than the current ones, and cite them by title and page.

Set the APN

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

Source: SIMCom A76XX Series AT Command Manual V1.12, pages 117 to 120.

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

Choose the radio technology

AT+CNMP=38

2 = automatic, 13 = GSM only, 38 = LTE only.

Source: SIMCom A76XX Series AT Command Manual V1.12, pages 99 and 100.

Open the data connection

AT+NETOPEN

In LTE mode the manual forbids activating or deactivating the default bearer (context 1) with AT+CGACT: it comes up at attach. AT+NETOPEN opens the internal TCP/IP stack.

Source: SIMCom A76XX Series AT Command Manual V1.12, pages 323 and 324.

Choose the USB network interface

AT$MYCONFIG="usbnetmode",1

0 = RNDIS, 1 = ECM.

Source: SIMCom A76XX Series AT Command Manual V1.12, pages 676 and 677.

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+CSQ

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 SIMCom A76XX Series AT Command Manual V1.12, page 73.

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.