If you text on a smartphone, chances are you’ve seen the problem: blue text bubbles versus green texts. It's a visual symbol of the problems that Android and iPhone users have when trying to text each other. WSJ’s Nicole Nguyen on the blue-green texting divide and one company’s fight to pop Apple’s iMessage exclusivity. Further Reading: - The Fight Over Apple’s iMessage and Those Green Bubbles  - Why Apple’s iMessage Is Winning: Teens Dread the Green Text Bubble  Further Listening: - How Apple Lost to the EU  Learn more about your ad choices. Visit megaphone.fm/adchoices