iphone (or any mobile) application

We need a simple iphone (**or** any other mobile phone) application that has a webservice interface to our Server. More details: Currently, we are doing a proof of concept to prove that an application built on the mobile phone can access webservices data. Basically, its just a demo application and if you can do a basic Webservice integration for any mobile phone (preferably iphone or blackberry), there may be a major follow on project for you. IMPORTANT: We want the demo application to run on any **one** mobile phone. The contract is for a demo application and a full fee will be paid for creating the demo app. Let me know if you are interested in the application development and give me some referrals to be sure that you can build an application for mobile phones. Thanks. Ritesh