gos27371 What network are you using on US Mobile?
I've tried the Warp (Verizon, used to work, now doesn't) and Dark Star (AT&T) which has never worked. I am a USM user and I am unable to get it working again.
EDIT: I have 2 lines on my phone right now, using each network. I didn't try Light Speed (T-Mobile) because it was reported that T-Mobile all around was having issues.
EDIT 2: When did you switch from Mint to USM? I wonder if the 24-36hr window hasn't hit you yet.