Sprint kicked the wireless industry’s price war up a level Tuesday, saying it would let subscribers pay half of what they are paying to AT&T or Verizon in perpetuity if they switch from those carriers.

The Sprint plans would offer unlimited talk and text and however much data the subscribers were buying from AT&T T, -2.26% or Verizon VZ, -2.15% . Customers must provide their current wireless bill when signing up. It if is for $160 a month, they will pay $80 a month at Sprint.