Each year, as the Super Bowl approaches, all three major US carriers announce their latest upgrades to ensure the stadium hosting the Big Game has enough high-speed network capacity to handle the hordes of fans attending with a smartphone in every pocket. But every year, some are left complaining that they couldn’t post their bragging rights live because everyone was trying to send messages, photos and videos all at the same time. Just four months after this year’s Super Bowl, the game’s site in Santa Clara, California, was transformed — its Levi’s logo famously covered up — to host several FIFA World Cup games. For the Paraguay vs. Australia matchup on June 25, it was the fifth time in two weeks that the nearly 69,000-seat arena was packed with fans eager to watch the world’s biggest soccer tournament. The matches have drawn millions more eyeballs than the annual NFL championship, from viewers at home to the thousands of people who have come from all over the world to watch them live — and who will …