According to Infonetics Research, the number of mobile broadband-enabled tablets (e.g., Apple iPad, Motorola Xoom, BlackBerry PlayBook, HP TouchPad, etc.) sold in the second quarter vs. the first quarter of 2011 jumped 80%, with 14 million tablets sold worldwide in 2Q11.A total of $31.4 billion was spent on smartphones in 2Q11, down 1.4% from the previous quarter despite unit shipments being up about 2%, indicating unit-price erosion impeded revenue growth. Infonetics expects global smartphone revenue to grow 31% in 2011 over 2010, to $117 billion.Combined across all vendors, Android continues to be the No. 1 smartphone operating system (OS) in the world, used in nearly half of all smartphones shipped worldwide.