Android and iOS apps for magnetic sensor data

We need you to write iPhone (iOS) and Android apps to measure the location, accelerometer and magnetic data from the phone's sensor and send it to a sever at a regular polling interval or at a rate set by the user. The app should work in the background. Find way to minimize battery use. The App should also plot a map with color icons for each magnetic points (sent from the server). More details later. We would like this project to be completed as soon as possible with 10% bonus for completing it in time. Client Features Collect Magnetic Bx,y,z accelerometer x,y,z Location GPS or Cell triangulation and uncertainty Device Cache Configurable by User Disable App Measurement polling frequency Location anonymity Data to/from server frequency cellular and/or wifi Measurements, Housekeeping and Results Server communication Send all the data to the server By polling interval Store data in cache if internet connection not available GUI Map of all users contributing (will get this from the server) : dots on map with symbols indicating: Magnetic data intensity