- Nov 9, 2015
T-Mobile and NationalDayCalendar.com have established that the day before Valentine's day will hereby be known as National Break Up with Your Carrier Day. In honor of the new National Day, T-Mobile is launching offers for new customers who switch from other carriers. NationalDayCalendar.com decides days of the year to observe seemingly random ideas and events to raise awareness or purely for marketing purposes. For example, there are 7 observations for February 11 alone. National Make a Friend Day National Don't Cry over Spilled Milk Day National White Shirt Day ...