Default [Q] Freedompop Mifi 2200 SIM Card in iPhone

I read here:

that I can use an iPhone or iPad with the freedom pop service by that way. I'm curious as to your experiences. And if that LTE SIM will work in a 3g iphone from sprint. I was also wondering if we took a sim like that that had 3G roaming service too enabled, if it would work. Any experiences, ideas, tests, anyhting other interesting is welcome. Have a great day!