Do you have requirement for 3G, 4G (LTE) router with console port? I have good news for you. Conel v2 routers from FW 3.0.9 revision supports this functionality. What you need is router with HW optional module XC-RS232, which gives you a serial port. Optional port 1 or port 2 can be fitted with
Only FULL version of v2 routers
Add below into
iniitab of the router with RS-232 optional port.
::respawn:/sin/getty 9600 /dev/ttyS0
S0 is Optional port P1 and
S1 is Optional pot P2.
This is great option for local access to the router in case you cannot or don't want to unplug ethernet devices from the router for operational or maintenance purpose.