It works! It's all about being on the right data plan I guess. I called tech support 3 times with no success and only a small amount of willingness to help (due to the it's for a Mac) finally from the last person I spoke to. My friend who is also a manager of a couple independent nextel/sprint stores checked on what plan they had me on and got me put on the correct one. Yesterday many many attempts to tether. She switched the plans last night today I tethered first try using the SPRINT PCS VISION modem script.