Data Mobile App

I would like a mobile app created in VB.NET. first for Windows Phone 8, then iPhone and then possibly Android. Features... Has 4 sets of credentials (ID and Password) - The first belongs to the owner of the app - The second, third and fourth belongs to 3 people the owner chooses. - The owner can unlock the app with his/her credentials and make changes at will. - The app can also be unlocked if all 3 additional credentials are entered but no updates are allowed. It is in view only mode. The data stored must be encrypted with the highest encryption algorithm. The data file must be able to be stored anywhere for safe keeping and imported to the app when required. The data can be imported to any phone with the app installed but only viewable with the correct credentials. Fields Required: - Category - Description - Content - Comment - Other Must be able to add, update, delete categories on the fly. *** I am on a limited budget so please provide the estimated time to complete when applying for the job.