 The Netbeans is a free, open-source Integrated Development Environment for software developers. The NetBeans IDE Bundle for Mobility is a tool for developing applications that run on mobile devices; generally mobile phones, but this also includes entry-level PDAs, among others (http://www.netbeans. org/community/releases/55/). Sun Java™ Toolkit 1.0 for CDC based mobile devices. The Sun Java Toolkit for CDC is a set of tools for developing applications that run on a range of On Secure JAVA Mobile Application network-connected consumer and embedded devices that support the Java ME CDC application framework, including high-end wireless devices (http:// www.java.sun.com/products/cdctoolkit/). Open-source BouncyCastle Crypto Package-mobile edition (J2ME). The package contains a lightweight J2ME API suitable for use in any mobile envi- ronment with the additional infrastructure to conform the algorithms to the JCE framework. During the development of the java mobile application it used the mobile edition package-version 1.37. (http://www.bouncycastle.org). Apache TSIK open-source library with security features for Web services, such as XML Signature, XML Encryption. Apache TSIK is a client and server toolkit for creating secure XML applications (https://svn.apache.org/repos/ asf/incubator/tsik/). Open XKMS 2.0 library. The Open XKMS is an open-source implementa- tion of the W3C Recommendation of the XKMS 2.0. It is a compound of an XKMS Server and a Client API to access to the Server via Web Service (www. sourceforge.net/projects/xkms/). 11.5 Conclusions In this chapter, we present a possible model of secure SOA-based e/m-government system. In fact, this work is related to the consideration of some possible SOA-based e/m-government online systems, that is, about secure mobile communication between citizens and companies with the SMGOs, such as municipalities. We elaborated an m-government framework which is based on secure JAVA mobile application, PKI certificates, SOA-based platform, XML-security, WS-security, SAML, 