After two stabs at unlimited hotspot data -- which involved severe limits on data speeds, as well as heavy throttling -- Karma is calling it quits. As a replacement, the startup is launching a new series of tiered plans dubbed Pulse, which start at $40 a month for 5GB of data. If you need more data, there's also a 10GB plan for $75 a month, and a 20GB option for $140 a month. Having learned its lesson from extreme restrictions, Karma says it won't be throttling or limiting bandwidth for Pulse plans (expect speeds between 6 megabits per second and 8 Mbps, instead of being stuck at 5 Mbps). You'll also be able to connect up to eight devices, just like Karma's "Refuel" pay-as-you-go plan, rather than being limited to five connections.