Keynote Systems has added a number of the most popular smartphones to its global, on-demand network for testing and measuring the performance of mobile applications, content and services.

The company has installed iPhone, BlackBerry, LG Dare, Samsung Instinct and Nokia N95 devices at its network locations in New York, San Francisco and London. Plans to add other smartphone models are in the works.

Using Keynote's Mobile Device Perspective service, companies can test and monitor how their content and services work using actual devices running across various carrier networks around the world. MDP allows companies to see the true end-user experience, from content availability all the way through delivery and accuracy, and make sure that it's not timing out or delivering a version that's not compatible with the user's handset.