A:Answer Unreal Mobile has two "branches," they have some Sprint-compatible phones, which have been switched over to Red Pocket for service. (Which I do not like) The other Unreal branch uses GSM-compatible phones, on the (I guess) AT&T or T-Mobile towers. This is the kind I have, which this SIM card works with.
I suppose Unreal might work on US Cellular, but why would you want to pay both companies??? Unreal Mobile works ok for me; never tried US Cellular.
I do like my Unreal Mobile phone, incidentally, works well for me. There are AT&T towers in my area, but Sprint--not so much. Oh, and I did not purchase a phone from Unreal, just used their BYOP plan, put in the SIM from Unreal, works fine. It's a VOIP service, Unreal Mobile.