Its two big rivals also habitually reward shareholders, and generously at that.Typically, a dividend raise from a large-cap stock isn't very massive. Such companies typically have a great many shares outstanding, so even a modest hike in the shareholder payout could mean additional expenses of millions, possibly even billions, of dollars. So for the most part, whenever one of these titans declares a dividend raise, it's more of a bump than a jump.That sure wasn't the case with telecom T-Mobile US (TMUS -0.1 ...