tmobile has a '3rd line free' deal up on many consumer and business plans. we're looking at the 'coremobile' plan at $90 for three lines after the 3rd line free and autopay discount.

they also have another promo when you byod (bring your own device) of $600 (over 20 months) bill credit per line (can bring over more than one), for business accounts and $85/mo (after autopay discount) service.

all of our phones will work on basically any american carrier. two were purchased at retail without any ties to a carrier. the third was bought from a carrier's agent but is paid for and unlocked.

can the two combine, basically giving us 'free' (except taxes and such) service for the first twenty months?