Hi,
Please provide me the full project details, wireframes, documentation, referenced app links if possible so that I can get your full app idea that will help me to sort out all the workscopes, and then I can able to revised my budget finally.
For your concern, we have developed 250+ apps for Android, iOS, BlackBerry and Windows phone.
Please check this out to see our portfolio and feedbacks from clients - http://www.freelancer.com/u/Droidbd.html
My s-k-y-p-e ID: droid-bangladesh-limited
Thanks.