No two companies love one another more right now than ATT and T-Mobile, which is why T-Mobile CEO John Legere has taken the extra step this year to send ATT a Valentine’s Day greeting of his own. On his Twitter feed, Legere posted a picture of a couple passionately kissing along with the tagline “Let’s kiss and break up… with ATT.” Legere’s latest attempt at starting a meme ties into T-Mobile’s “breakup letter” campaign where customers who switch to T-Mobile can send readymade breakup letters informing their old carriers they’ve been dumped. T-Mobile, which added a very impressive 869,000 postpaid subscribers last quarter, said last month that more than 80,000 switchers have sent breakup letters to their old carriers and we