I am trying to help someone set up a R11e-LTE, primarily as an LTE modem. and we've struggled to get it on-line. One issue we had is trying to find the APN to use. In the end I reverted to putting the SIM in my phone which lists the Access Point Names. Is there any way of getting the router to scan and display a list of available APN's?

Ultimately he would like to disable all LAN/WAN routing and put the router into modem only (bridge?) mode so it passes its WAN IP straight through to a router connected to the ethernet port. This is so he can use the other router's Dual WAN capability for backup/failover and avoid too much NAT'ing. This seems to be different to the bridge function described in the RouterOS pages. I've tried turning off NAT and the firewall but my test laptop would not then make a connection. Was that the correct thing to do, and if so should I have changed the laptop configuration to something like PPPoE/A? Or am I going completely wrong?

According with the documentation you can easy set the APN, PIN and scan the network : https://wiki.mikrotik.com/wiki/Manual:Interface/LTE
My suggestion is to keep the LTE part and LTE IP on the Mikrotik, and NAT outside from the lte interface.

Unfortunately, "/interface lte scan" does not list APN's or are you thinking of another command? Would it be possible with AT commands? Do you know of an AT command reference?

In terms of NAT'ing, my friend was planning on a dual WAN router for failover and/or load balancing. With that sort of set up I always prefer to have the main router with the WAN IP's. From what I saw on the 6.41 reference further down your link, it may came with the ability to bridge an LTE connection. I was wondering if there was another way of achieving it (I'd already seen the link). Ultimately it still may not be worth it as the LTE connection is often already NAT'd.