I e-mailed them, they said:
"We are sorry to inform you that US Cellular phones are not supported by
our Bring Your Own Phone (BYOP) program at this time. Its technology is
not compatible with our BYOP SIM cards. Only T-Mobile, AT&T compatible
handsets or unlocked domestic GSM phones will work with this program.
This program will not work with BlackBerry, CDMA phones (i.e. Verizon,
Sprint, Metro PCS) or branded Straight Talk, TracFone, SafeLink and
What exactly is a "unlocked domestic GSM phone"?