An app for a pet sitting business

I developed an Android app for our team of pet sitters so that when they arrive at a house they start the app on their android phones which contacts a php script on my web server and sends a list all of their dog visits for the day displaying them by dog name in a simple drop down menu. They choose the dog they are about to start walking and click Start which then populates a text app on their phone with a message prefilled in and the dog's owners phone number. The other button instead of Start is Details. Clicking on this shows the dog walker all the of relevant details about the dog they are visiting. All this info, including the owners phone number for texting was fetched from the php script during the initial bring up of the application. Other than that the android app has a preferences screen that allows the dog walker to enter their username, password, and location since we have more than one pet sitting location. Im looking for an iphone developer that can write this simple app and have it function much like the existing android app I developed.