We have gone through your requirements and images, It is really nice designed. It will really impact the user and help to grow your business.
We have seen your iPhone images, from that we understood that, app stores the services history for cars, user can also register, login. User can also add his/her car screens. There will be settings page where users can change their passwords.
We will also implement maps in the app where on the map each branch will be shown. There will be a button on clicking that it redirects to a link. There are some offers that we will have to show in the home screens. There will be a gallery page where images, videos will be shown and about page where some info will be there.
Details in the app will be pull from web services, like , offers, service history of the car. In gallery, all the images, admin uploads and videos, we will have to pull the details from the services. All the web services you will provide. Please confirm.
The screens you provided , In android all the screens will be exactly same as what you have provided. If possible then please give the link for iPhone so that we can install it here, It will clarify our confusion more clearly and gives us a clear idea about the app. If there is any website for that then also please give that link too.
Regarding the location that will show in the map. Could you please clarify what do you mean by here branches? Is it the branches of the users. Please confirm.