After doing some research, I was ready to move to Tmobile and take advantage of the free 3rd line promo. The store clerk told me that the promo was over on 3/5. It was on for all of five days or so. Anyone knows how often Tmobile runs this type of promotion? I'll have to be a little quicker the next time around.
Some of these promos fly by pretty fast. I don't have any details on when the next one will be going on but we don't do them too frequently. I would say it's about 1-2 times a year. We'd love for you to switch over to the Uncarrier. You can keep an eye on www.t-mobile.com for any new promos.