Trulia has integrated click-to-call with its call tracking solution called Instant Leads, giving real estate agents the ability to respond to leads faster than anyone else in the industry. This integration allows agents to quickly connect with prospects via live calls or send text messages if the prospect doesn't include their phone number or the agent is busy. The integration also provides call analytics, allowing agents to track incoming calls and measure the return on investment of each campaign. With this data, agents can optimize their investments for maximum ROI. Trulia's Instant Leads is a powerful example of Twilio's capabilities, and anyone with web development skills can build their own click-to-call solution or call tracking application using Twilio's APIs and resources.