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/interface lte set lte1 modem-init="AT%CLCMD=1,1,6300,384,\"24701\",6300,385,\"24701\""

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Cell

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Monitor

Cell monitor allows to scan available nearby mobile network cells:

[admin@MikroTik] > /interface lte cell-monitor lte1 
PHY-CELLID BAND         PSC EARFCN                 RSRP          RSRQ          RSSI         SINR
        49 B20              6300                -110dBm       -19.5dB
       272 B20              6300                -116dBm       -19.5dB
       374 B20              6300                -108dBm         -16dB
       384 B1               150                 -105dBm       -13.5dB
       384 B3               1300                -106dBm         -12dB
       384 B7               2850                -107dBm       -11.5dB
       432 B7               2850                -119dBm       -19.5dB

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Gathered data can be used for more precise location detection or for Cell lock.

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Troubleshooting

Enable LTE logging:

[admin@MikroTik] > /system logging add topics=lte

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Check for errors in log:

[admin@MikroTik] > /log print

11:08:59 lte,async lte1: sent AT+CPIN? 
11:08:59 lte,async lte1: rcvd +CME ERROR: 10 

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search for CME error description online,

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To check all supported bands run at-chat command:

[admin@MikroTik] /interface lte at-chat lte1 input="AT^SYSCFGEX=\?"

output: ^SYSCFGEX: ("00","03","02","01","99"),((2000004e80380,"GSM850/GSM900/GSM1800/GSM1900/WCDMA BCI/WCDMA BCII/WCDMA BCV/WCDMA BCVIII"),
(3fffffff,"All Bands")),(0-2),(0-4),((800d7,"LTE BC1/LTE BC2/LTE 
BC3/LTE BC5/LTE BC7/LTE BC8/LTE BC20"),(7fffffffffffffff,"All Bands")) 
OK

Example to lock to LTE band

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 7:

[admin@MikroTik] /interface lte set lte1 modem-init="AT^SYSCFGEX=\"03\",3FFFFFFF,2,4,40,,"

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Change last part 40 to desired band specified hexadecimal value where:

4 LTE BC3
40 LTE BC7
80000 LTE BC20
7FFFFFFFFFFFFFFF  All bands
etc

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All band HEX values and AT commands can be found in Huawei AT Command Interface Specification guide

Check if band is locked:

[admin@MikroTik] /interface lte at-chat lte1 input="AT^SYSCFGEX\?"

output: ^SYSCFGEX: "03",3FFFFFFF,0,2,40
OK

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For more information check modem manufacturers AT command reference manuals.

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For mPCIe modems to work in RB9xx series devices it is required to set the USB type to mPCIe, this can be done using the following command:

/system routerboard usb set type=mini-PCIe

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In case your modem is not being recognized after a soft reboot, then you might need to add a delay before the USB port is being initialized. This can be done using the following command:

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/system routerboard settings set init-delay=5s

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Modem firmware upgrade

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Starting from RouterOS version 6.44beta20 it is possible to upgrade modems firmware.

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Check currently used firmware version by running:

[admin@MikroTik] > /interface lte info lte1 once

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revision: "MikroTik_CP_2.160.000_v008"
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Check if new firmware is available:

[admin@MikroTik] > /interface lte firmware-upgrade lte1 
  installed: MikroTik_CP_2.160.000_v008
     latest: MikroTik_CP_2.160.000_v010

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Upgrade firmware:

[admin@MikroTik] > interface lte firmware-upgrade lte1 upgrade=yes
  status: downloading via LTE connection (>2min)

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Whole upgrade process may take up to 10 minutes, depending on mobile connection speed.

After successful upgrade issue USB power-reset, reboot device or run AT+reset command, to update modem version readout under info command:

[admin@MikroTik] > /interface lte at-chat lte1 input="AT+reset"

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if modem has issues connecting to cells after update, or there are any other unrelated issues - wipe old configuration with:

/interface lte at-chat lte1 input="AT+RSTSET"

Avoiding tethering speed throttling

Some operators (TMobile, YOTA etc.) allows unlimited data only for device SIM card is used on, all other data coming from mobile hotspots or tethering is highly limited by volume or by throughput speed. Some sources have found out that this limitation is done by monitoring TTL (Time To Live) values from packets to determinate if limitations need to be applied (TTL is decreased by 1 for each "hop" made). RouterOS allows changing the TTL parameter for packets going from the router to allow hiding sub networks. Keep in mind that this may conflict with fair use policy.

/ip firewall mangle
add action=change-ttl chain=postrouting new-ttl=set:65 out-interface=lte1 passthrough=yes

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More information: YOTA, TMobile

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Check current PIN code status:

/interface/lte/at-chat lte1 input="at+cpin\?"

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If card is locked - unlock it by providing:

/interface lte at-chat lte1 input="AT+CPIN=\"PUK_code\",\"NEW_PIN\""

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Replace PUK_code and NEW_PIN with matching values.