How many Japanese carriers would have guessed already have 100 percent HSPA+ coverage? 3? 5? 17? Believe it or not, the answer was a big, fat goose egg until up-and-comer eMobile stepped up to the plate and upgraded its back end in recent days. Customers with properly-equipped hardware are now cruising along at up to 21Mbps (well, theoretically, anyhow), which should be more than enough to take 'em into the LTE-based next phase of their plans for world domination. It's said that since garnering its spectrum license back in 2005, eMobile has already managed to capture some 15 percent of Japan's HSPA market -- an impressive stat, considering they've got to go head-to-head with giants NTT DoCoMo and SoftBank Mobile -- and HSPA+ certainly won't hurt their cause.