Make mobile applications that work. Just what you need to get mobile messaging going on virtually any platform, in virtually any language, this guide provides a thorough tutorial in the SIM (Subscriber Identity Module) programming environment, today's most-used mobile applications technology. Smart card expert Scott Guthery teams with information management specialist Mary Cronin to show seasoned developers how to: design, build, and integrate SMS messaging into your applications environment; create code that harnesses the power of the SIM; use the micro-browsers and micro-Web servers in 3G phones; construct leading-edge mobile commerce applications on today's networks; send and receive SMS messages from your server or your laptop; enable interfaces and other needed components; and, create secure wireless applications for corporate networks and VPNs.This book is for you if - you're building applications for GSM or 3G networks; you know that today's 2 billion SMS messages per month are not enough; you wish you had sample code for reality-based applications; you want to add mobile extensions to your software products and corporate network; you manufacture smart cards or create smart card applications; you seek reliable answers on 3G programming interfaces and toolkits; you want guidance on SIM application design, integration, or management for any platform; you prefer to avoid others' mistakes. Other books offer application overviews. "Mobile Application Development Using SMS and the SIM Toolkit" gets you writing code.