Questions about moving from Vivint

Awesome. Thanks everyone. Looking forward to the switch.

Out of educational curiosity, I had one more question. Vivint somewhat recently had me do a firmware update to v1.19.3.1 on my old 2GIG GC2 panel and then sent me an LTE module replacement to self-install (I guess they were too cheap to send a tech). If I did want to keep the 2GIG panel, would I still need the Surety LTE module kit? Or could I feasibly just do something like a SIM swap and re-use the Vivint LTE module?