SAN FRANCISCO — Since its debut in 2007, millions of people have gravitated toward Apple’s iPhone, wooed by its sleek hardware, simple user interface and abundance of applications.

Other smart phone makers have been trying since then to dispel the notion that the iPhone is the be-all and end-all of mobile gadgets. The latest push comes from Verizon Wireless and Motorola, whose Droid is a good alternative for those seeking a feature-packed smart phone with a full keyboard and strong wireless service.