iOS 6.1 introduced an odd Exchange calendar syncing bug, and today Apple released iOS 6.1.2 to fix it. The issue resulted in heightened network usage that would significantly reduce the battery life of affected devices. If you use an Exchange account with your iPhone, you'll wanna grab this over-the-air update now. No word yet on if iOS 6.1.2 also fixes the lock screen bypass bug that was discovered last week as well, but we'll check on that as soon as we're updated.