Here’s a quick quiz for you: Which smartphone in the U.S. accesses the mobile Internet the most? If you guessed the iPhone, you’re wrong. According to metrics published by the mobile Internet ad-serving company, AdMob, More RIM BlackBerry 8100 smartphones accessed the Internet in the U.S. in August than any other smartphone–although the Palm Centro was right behind the 8100. The Apple iPhone was actually the fourth most-used smartphone in August in the U.S. for mobile Internet access (the RIM Blackberry 8300