The success of Web Services, an open Internet standards based technology, opens the door to the construction of business applications in the distributed computing world. As Web Services are based on open standards, it lets the integration of different kinds of software components, including the wireless and mobile applications. However, the Post PC World, dominated by mobile devices, is not completely ready to Web Service accesss, due to memory and processing constraints. Specific architectures for an easy and clear Web Services integration are required.This article introduces the main aspects related with Web Services access from mobile devices. Two proposals are presented for high and low end mobile devices, using Java 2 Platform, Micro Edition (J2ME) Web Services API (WSA) and Short Messaging Service (SMS) respectively, which define a specific architecture for each case.

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Security requirements are more demanding in the e-commerce domain. However, mobile e-commerce settings not only insist on security requirements, they also require balance between security levels and hardware and usability device ability. These features require designing models having simple authentication and authorisation scheme which also ensures information integrity for each e-transaction. The Mobile and Wireless Applications’ Development Interest Group W@Pcolombia thus developed the P3SIM platform so that mobile applications might include SIM parameter-based security features. The P3SIM platform’s framework and compilation and simulation settings combines the advantages of identification provided by the SIM module with the security features provided by SATSA and Java Card APIs for Java ME environments, one of the most-used platforms for mobile application development. Developing an m-commerce-based prototype not only shows the platform's ability to operate in secure environments, it also shows its ability to comply with environmental security requirements.