thanks for the clarification!

another question... is that a $9.99 per line rate? I'm on a family plan and wonder if the add-on covers all under the plan, or only the one line. My guess would be its a per line rate...

and another question... if I choose not to add the $9.99 unlimited hotspot calling, does it make sense for me to enable UMA on the 8900 when at home? My house has some spotty areas so it would be great to be able to use UMA at home as a "signal booster"