Data Activation Center (DAC) mailed me 2 SIM cards, AT&T and Verizon. They setup temporary accounts for testing. I was unsuccessful with the AT&T, APN: dac.com.attz and VERIZON, APN: vzwinternet. I was not able to toggle on Mobile data in the ReachView 3 App. I was partially successful using the VERIZON, APN: so01.vzwstatic combination. The VERIZON, APN: so01.vzwstatic, would allow me to toggle on Mobile data but would constantly turn itself on and off. DAC personnel said they saw this ON/OFF behavior on their end as well. I provided Emlid a Full System Report. They are still reviewing all of the information I have provided. No further updates as of yet.
My Opinion: Based on my limited testing, it appears the new RS2+ Global LTE Modem may not be working properly with AT&T and partially with Verizon. Based on my experience with AT&T (the company), I am hoping Emlid can find a solution that works with DAC. DAC says they are willing to continue to help if needed.
If anyone else has a similar or different experience with the new RS2+ Global LTE Modem, please post.