Acryli
Quectel EM12-G is the best of not MikroTik modules, and my favourite, but he must be used with additional components via 12$ :(.
My SETUP’s are
~90$ Quectel EM12-G with 4$ mPCIe<->M.2 B-Key with sim slot adapter with 2x 1$ Pigtails MHF4 F <->uFL F and SXTR/LHGR/LDFR work properly.
I use firmware EM12GPAR01A18M4G who works in MBIM mode.
RouterOS v7beta2 with bunch of own scripts… but I plan create a one big thread about LTE and maybe do some movies…
Band selection, 3g/lte works out-of-box. Allow-Roaming works, but you must set this in ISP too in some country.
APN in USA must be with disable UseNetworkAPN to start work your APN, but in EU\Poland works whatever you configure.
Passthrugh - I not use that, sorry. Watch that instead: Passthrough | Make your LTE interface shine
Cellular tab works perfect.
Status tab not show any information about registration in ISP, PIN status etc… this is not supported but maybe this will change bcs all that can be reach from AT commnand.
The best is the Cell-Monitor is supported, this is a very big win for my projects.
Tip: How save Cell-Monitor to file where he not have a file= as-variable and his result are not save as variable… by that:
execute "/interface lte cell-monitor lte1 max-age=1m duration=1m" file="stdout.txt";
delay 61s;
file edit stdout.txt content
SMS works.
/tool sms set auto-erase=yes port=lte1 receive-enabled=yes
tool/sms/inbox/print
…
I always use every 5m script who read 1 new sms (if exist) and re-send it to my e-mail. Mostly that one with text “You have 80% limit…” 
Yes, I can grab new SMS and if they have proper content do local action even if unit is offline but SMS still work.
Cell Lock works perfect. They are no Frequency Lock 
but you can setup few Towers Antenna as few Cell Lock. More detail here.
Info:
Any AT Command give you a message: failure: modem not ready
then you must use a USB WWAN adapter and enable USB3.0 by: AT+QUSBCFG=“SS”,1
and re-install EM12-G into e.g. RBM33G who now will be working with lte1 with AT commands too.
At Chateau LTE12 who have Quactel EG12 you should have that CA possible and remember that module can disable CA when you not generate a traffic and when you generate traffic then CA can be show again. Additional do some testing with downloading torrent file with e.g. Ubuntu iso file to confirm or not problems like:
- EM12 loses band in CA after a while if signal is weak
- EG12 and CA failed after 5 minutes or more on dynamic aggregation
About RouterOS 7.*
Two big problems:
- LTE is slow (30mb instead 140Mbps at the same CellLock 1band)
LTE b7+b7 does not work Chateau 12 - remote SIP not register
Chateau LTE12, No VoIP with RouterOS v7.0beta7 or beta8, works with beta5 and beta6
Both work’s properly in ros7beta5