Hello,
Yes, RUT9 routers can switch to second SIM card once specified data limit is reached on the first SIM card. RUT9 also have other "SIM Switch conditions", about which you can find out here:
https://wiki.teltonika.lt/view/Mobile#SIM_switching_scenarios
Which router to choose complete depends on your requirements. E.g.:
- If you need simple LTE router with 2 SIM cards, with LTE speeds up to 150 Mbps -> RUT950 might be a good option
- If you need a router with additional inputs/outputs, USB, RS232/RS485 or GPS -> You might be interested in RUT955
- If you need router with 2 SIM cards and LTE speeds up to 300 Mbps -> You should be looking at RUTX device series
Here is a comparison between these routers:
https://teltonika.lt/compare/?networking=rut950,rut955,rutx11