Apple’s most popular product is the iPhone. It makes most of its money from the iPhone too, leaving little doubt that it is the company’s core product. But in a quarter without a new iPhone, and one in which the iPad has continued to gather steam as it’s released in more countries, it’s worth wondering if the iPad could be finally rivaling the iPhone in terms of sales and significance to Apple’s bottom line when it reports its fiscal third-quarter earnings on Tuesday. Read the full story at GigaOM.