The LTE cellular interface on the AR is not Up

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Huawei devices must use the LTE data cards of E392 and E8278. Otherwise, various configuration problems may occur.
Because frequency planning varies from countries and different carriers have different authorized frequency bands, you need to confirm whether the frequency bands supported by carriers are consistent with those of the LTE data card when the LTE data card used by an enterprise meets requirements of LTE services.

Other related questions:
Does the LTE cellular interface support PPP
The LTE cellular interface supports PPP. The following physical interfaces also support PPP: - Synchronous or asynchronous serial interface working in synchronous mode (the interface type is the serial interface) - Async interface working in protocol mode - Serial interfaces formed by CE1/PRI or CT1/PRI interfaces, which have the same logical features as synchronous serial interfaces - Serial interfaces formed by CE3 or CT3 interfaces, which have the same logical features as synchronous serial interfaces - Serial interfaces formed by E1-F or T1-F interfaces, which have the same logical features as synchronous serial interfaces - Serial interfaces formed by E1/T1 channels that are channelized from a CPOS interface, which have the same logical features as synchronous serial interfaces - Cellular interfaces - ISDN BRI interfaces - POS interfaces Note: For LTE cellular interfaces, only the E392 data cards support the link-protocol ppp command.

Can 3G/LTE be restored after remove interface-cellular is executed
To ensure information security, an administrator can run the remove interface-cellular command in the diagnostic view to shield the cellular interface on the AR so that common users cannot use the 3G or LTE function for communication. The configuration takes effect only after the AR restarts using the reboot command. After the configuration takes effect, the 3G or LTE function on the AR is unavailable and cannot be restored. Exercise caution when you run the remove interface-cellular command. After the configuration takes effect, you cannot run the remove interface-cellular command; otherwise, the AR displays an error message.

How do I configure a 4G interface on an AR
The procedure for configuring an LTE interface is as follows: [Huawei] apn profile lteprofile //Create an APN profile. [Huawei-apn-profile-lteprofile] apn 3GNET [Huawei-apn-profile-lteprofile] user name lteuser password cipher Password@123 authentication-mode auto [Huawei-apn-profile-lteprofile] quit [Huawei] dialer-rule //Configure a dialer ACL. [Huawei-dialer-rule] dialer-rule 1 ip permit [Huawei-dialer-rule] quit [Huawei] interface cellular 0/0/0 [Huawei-Cellular0/0/0] link-protocol ppp [Huawei-Cellular0/0/0] ip address negotiate //Configure an LTE cellular interface to dynamically obtain an IP address. [Huawei-Cellular0/0/0] ppp ipcp dns request //Configure a DNS server address through PPP negotiation. [Huawei-Cellular0/0/0] dialer enable-circular //Enable C-DCC. [Huawei-Cellular0/0/0] dialer-group 1 //Associate Cellular0/0/0 with the dialer ACL. [Huawei-Cellular0/0/0] dialer number *99# //Configure a dialer number for calling the remote end. [Huawei-Cellular0/0/0] mode lte auto //Configure a network connection mode. [Huawei-Cellular0/0/0] apn-profile lteprofile //Bind the APN profile to the LTE cellular interface. [Huawei-Cellular0/0/0] shutdown [Huawei-Cellular0/0/0] undo shutdown [Huawei-Cellular0/0/0] quit

What is the default dial-up mode of the 3G cellular interface
On-demand dial-up.

How do I query call session information on a 3G modem of an AR
Run the display cellular interface-number all command to check information about call sessions on the 3G modem.

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