In case, I understand correct, the SIM mentioned is supposed to do a "silent" switchover to another carrier in case of mobile connection problems. I.e. to switch from AT&T to T-Mobile in the USA.
Which would be great for the wide distribution of a new IoT device, including a RUT955. However, marketing noise is quite often different to real world expirience. Any feedback from users of this SIM on a RUT955 appreciated. A theoretical discussion about the pros and cons welcome, too. As I am asking myself, what happens with active TCP-connections during switchover, although the IP is fixed ?