How to connect to the network on OpenWRT via USB modem in NCM mode?

Question

mobile connection

Good day to all.
Tell me how to connect to the network via a USB modem in NCM mode on OpenWRT.
You need to set up a connection, I set it up according to this article , my interface config turned out as follows:

config interface 'wwan'
        option proto 'ncm'
        option ifname 'wwan0'
        option device '/dev/cdc-wdm0'
        option apn 'internet.mts.ru'
        option username 'mts'
        option password 'mts'
        option mode 'all'
        option pincode '0000'
        option delay '5'

According to the indicator on the modem, it connects to the network, but there is no traffic and is not displayed anywhere (ifconfig, web interface), the modem itself is visible

[  381.304779] usb 1-1: new high-speed USB device number 2 using ehci-platform
[  381.486155] option 1-1:1.0: GSM modem (1-port) converter detected
[  381.492850] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
[  381.500733] option 1-1:1.1: GSM modem (1-port) converter detected
[  381.507440] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
[  381.663472] huawei_cdc_ncm 1-1:1.2: MAC-Address: 00:1e:10:1f:00:00
[  381.669952] huawei_cdc_ncm 1-1:1.2: setting rx_max = 16384
[  381.702527] huawei_cdc_ncm 1-1:1.2: NDP will be placed at end of frame for this device.
[  381.711171] huawei_cdc_ncm 1-1:1.2: cdc-wdm0: USB WDM device
[  381.718383] huawei_cdc_ncm 1-1:1.2 wwan0: register 'huawei_cdc_ncm' at usb-ehci-platform-1, Huawei CDC NCM device, 00:1e:10:1f:00:00

Please tell me how to fix this.
Thanks in advance for your replies