TMobile One - data cap for throttling




    I saw on the plan advertisement "On all plans, during congestion the top 3% of data users (>26GB/mo.) may notice reduced speeds until next bill cycle. Video typically streams on smartphone/tablet at DVD quality (480p). Tethering at Max 3G speeds."


    I am wondering if the data usage was based on a per line basis or the account usage?


    Also when do t mobile usually pull the Free 4th line promotion out?



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