clean up Iphone and Android APPs

Need absolute pro at writing IOS Iphone applications and Android applications in their native form. We have an app both on Android and IOS that do the same thing. The program is running but not 100% stable. sometimes it closes for no reason. Sometimes when user is uploading it will fail. More problems on android than on Iphone. Basic app does this: User logs in. Gets a list of tasks assigned to them. User chooses a task. Then answers a survey and takes 9 pictures. Then these items are uploaded. The web service commands that allow for the send and receive work fine but will take input on it. We think the problem is interrupted connections or failed connections because there are less problems when connected to wifi. HTC Evo users and iphone 4 users have more problems. 4s and better phones have less problems but everyone has some problems. I would provide code to both iphone and android app so that you could review and fix the problems with the app. Also give us a complete summary of the needed changes and why they where failing. Must be a pro and have much experience with this.