The easy way to hire the right iPhone development company is by looking at their portfolio. Every company has a website. And over there, they all mention their work and clients. By looking at the website and kind of work they do, you would get an idea of how company can meet your desired requirement.
Generally, a company is expert in developing an app for every operating system: iOS, Android, Windows and Blackberry. You can check iPhone developer in Perth via various online resources.
This becomes easy for you since you would get different experts under one roof. Plus, companies have experts in the field and a whole team ensures that the product delivered is at par with what you wanted.
While approaching the company, keep your questions and concerns ready; such as the time line of the task, the cost of the entire project, how they plan to address your requirements and others. These basic things will help you hire the right company.
You have an authority to ask them about the details like how many apps they have made till now, how many have been featured in Google and Apple app store, among others. These questions would help you understand if the company has the right talent or no.