Hi,
Please correct me if i'm wrong, but the way i see it, you are asking for LTE signal booster for two of your phones?
If i am correct, then here is a little clarification: RUT240 shall work as an LTE receiver, and shall broadcast internet connectivity in the form of WiFi. So, whether your phones are 4G or otherwise - they shall connect to RUT240 via WiFi (and not via 4G/LTE), and in this way utilize RUT240 SIM card's connectivity to LTE.
A little followup:
- the SIM card you need is 2FF (mini);
- other than that you shall need to make sure it has Data plan with necessary amount of GBs available;
You shall need to configure RUT240, to enter correct Mobile settings. You shall receive those with the SIM card or by inquiring to your ISP.
As for setting the router itself, you can follow these links:
https://wiki.teltonika.lt/view/RUT240_first_start
https://wiki.teltonika.lt/view/RUT240_Setup_Wizard
Hope this clears things up a bit