Forget holding up under torture — how many of us could even go a day without using our smartphones? Tech Guru Daily directs our attention to a new study from Bank of America (PDF) showing that 47% of smartphone users say they couldn’t last more than a day without their phone and that 13% actually said that they couldn’t last for more than an hour without it. In the same survey, Bank of America found that 51% of users checked their smartphones at least once an hour, with 35% saying that they check their phones “constantly,” which just goes to show how incredibly addictive our mobile devices have become. The most amusing question, however, was when Bank of America asked