US Mobile’s pitch: pick which network each line runs on. Want Verizon coverage on the family plan but T-Mobile’s mid-band 5G on the work line? You can. Pricing is genuinely flexible (custom-build a plan from talk/text/data sliders), and there are no taxes-and-fees surprises.
On the Verizon-backed "Warp" network, US Mobile inherits Verizon’s coverage. On the T-Mobile-backed "Lightspeed" network, you get T-Mobile’s mid-band 5G. The trade-off, as with all MVNOs, is occasional de-prioritization during peak congestion.