Service oriented architecture or SOA-based mobile solutions enable the reuse of granular modules of enterprise applications in a mobile device.
With this, a workforce need not depend on a device for processing corporate data outside the compound of the organization.
Mobile devices are becoming the center of innovation and development of concepts due to their flexible nature and the ease by which work is carried out on them.
Moreover, organization these days are making use of various concepts related to mobility in order to provide all the technical and corporate information to the workers while being located outside the boundaries of the company.
Mobility improves the efficiency of managing data, improves the accessibility to business data and helps field workers to productively execute their operations.
The issue or network access and security is taken care of earlier at the time of installation of the interface for remote access.
However, there are times when user needs to utilize the business applications and services for operational purposes in which case two possible solutions can be deployed:

• Embedding the mobile version of business apps and serving directly onto the device, or
• Using the applications as a service, remotely so that no special hardware configuration needs to be installed.
  

The first solution for this need is practically unattainable as it would eventually drop the performance of the device and users would be combating to use the device itself instead of the service, most of the time.
The latter solution includes the setting up of the compatibility between enterprise application and mobile devices so that the corporate apps can be used as a service on the device directly, by processing all the computational tasks on the server itself.
SOA or Service oriented architecture simplifies the approach of designing and developing mobile applications for this purpose.
Loosely-coupled architecture is the key feature of SOA which promotes and encourages the use of mobile devices for corporate data processing and other service.
The enterprise utilization of mobile depends on three tiers of communication which actually makes it possible for the workforce to use business apps over mobile device.

• The mobile device,
• the server, which hosts the applications and processes the requests &
• the middleware, which sets up the communication.
  

SOA is used in all the three layers or tiers of an enterprise mobile solution which assists in the development and deployment of mobile applications for the intended purpose.

• On the device, smartphones make use of such architecture and allow the reusability of components provided by the application and the operating system itself.
  This allows invoking and operating upon the in-built functionalities of the system and can even involving a remote application to interact with a local application installed on the device itself.
  
• On the server-side, where most of the enterprise applications reside, are majorly based on SOA nowadays.
  Majority of these applications follow the modular, loosely coupled development procedure which allows them to interact with local as well as remote services.
  Popularization of web services has also impacted the development methodology of business apps for remote access.
  
• The communication middleware plays a crucial role in providing SOA-based mobile solution and sets up the interaction module between the two ends i.
  e.
  the device and the server.
  A middleware transport, ensures quality of service, supports security, pre-processes messages and scales the message for smarter delivery.
  Enterprise service bus and mediation middleware are some of the component and service based middleware.
  Message processing is loosely-coupled and may rely on external or remote service which is a supporting factor in SOA.
  

This approach is a powerful tool for improving the efficiency and productivity of an organization.
This allows the processing of the light-weight requests on the smart-phone itself and forwards the heavy-weight queries to servers, which process and transports the result back to the device and assists the user in his operations.