So working with a local dealership which is very supportive of this effort. After speaking with Guardian and dealership an alignment of NEW radio is required to get SOS/remote services working again and as you mentioned a new SIM card. I have the new sim working through ATT but still required to work through a dealership to somehow program new radio/SIM card to work with connected services. Dealership asked for all old 8.4" part numbers and serial numbers and new 12" part/serial numbers so they can work with guardian to somehow program this. Hope to learn what exactly takes place to report back. Mostly want SOS button (for wife), and yes its fun to lock/unlock from my phone though I would really like to start/warmup truck.Most likely you will need to wait a bit for the connected services to show back up. what I'm talking about is the fact that i replaced my radio module which has the IMEI and ICCID tied to 4g cell service. because i swapped hardware Sirius XM can't connect to my truck because it's pointing to another device. this is like calling the wrong number. I'm working with them to assign my "number" to my truck so that it connects. They said give it a few days so I don't have a resolution yet.