In this chapter, we'll focus on using Twilio Client within your clients' browsers with Twilio's JavaScript plugin, Twilio.js (https://www.twilio.com/docs/client/twilio-js), alongside the Twilio PHP library we've already been playing with as a backend.
Tip
You can check your web browser's compatibility with Twilio Client on Twilio's browser testing page at http://clientsupport.twilio.com.
We'll also briefly cover how to use the Client in native mobile apps, enabled by Twilio's provided libraries for iOS (https://www.twilio.com/docs/client/ios) and Android (https://www.twilio.com/docs/client/android). On mobile devices, your users can take calls wherever they are, using cellular (for example, 3G and 4G) and WiFi connections.