In World Tech Update this week, Apple's iPhone 4S shows up around the world including China's gray market, Sony's Playstation Vita gets a US launch date, RIM restores BlackBerry service, Donald Trump digitally signs an e-book he penned and Fujitsu hosts a research open house.

Note: When you purchase something after clicking links in our articles, we may earn a small commission. Read our affiliate link policy for more details.
  
Shop Tech Products at Amazon