Work experience: iPhone application development is not an easy task. Beginners usually tend to make mistakes. So, whenever you interview any company, do not forget to ask them the number of years of experience they have got into the same field.
Portfolio: One of the most important things you can do is to ask them to show you their portfolio. It will contain their recent works, which will help you know the type of projects they work on. So, if your project is related to those that they work upon usually, there will be no room for error.
References: It is always a good idea to ask them the contact details of a few of their recent clients. You must contact them and ask about their work experience. This feedback and reviews about them will help you know about the quality of their work.
Expertise: You must always know the services which they provide. However, you must choose the one who has got specialization into the iPhone application development.
Team: When you meet the team, speak to all the team members, right from developers and designers to writers and testers. Discuss your project with them and ask if they will be able to deliver the same in the preferred time. Ask them which tools and technologies will they use for the project and also that, how much will they charge for the entire project including the post-development services. As in search of a company unlike wordpress company, Make sure you interview four to five companies. Once you are done with interviewing all of them, compare each factor and then select the best one; the company that will provide the best services at the least price can be considered as the best company. Now that you are aware of some of the best points to consider when choosing the iPhone app development company, for iPhone Development Services make sure you choose the best one. Good luck with that!