I recently purchased a ZTE N9810 (aka Virgin Mobile Supreme and Sprint Vital). I was easily able to root it via the Kingo one-step root software (and yes, I used rootchecker to confirm the root was successful.) However, I have tried several different tethering apps and none of them are able to broadcast a wifi signal to my laptop or other phone I have. I used barnacle; it said it was running and beaconing the signal, but I was unable to actually find the network. WiFi Tether wasn't working either. I know that there hasn't been much work done with this phone, but I'm wondering if anybody can help me set up a tether with it.
So while I was writing this, totally frustrated, I was still screwing around with WiFi tether and I figured out how to make it work. Root your phone with Kingo (or however you want, but Kingo seems like by far the easiest solution.) Download from the Play Store "WiFi Tether for Root Users" by Muller, Lemons, Buxton. Go to settings, change device-profile, select Samsung Galaxy Nexus (CDMA/LTE). You should be good to go.
Sorry if this is in the wrong place, but I could not find any information on getting tethering to work with this phone anywhere on the internet, so I hope this helps somebody out.