Making sure that you are dealing with reputable mobile phone application development companies is very important if you want them to do a proper job on your project so ask these questions to determine what you can expect from the company you are considering.
In what year was your first app published?
You are looking for an answer after 2008 but as close to it as possible. If they name a year before then for iPhone and iPad you should know that they are lying as the Apple App Store only went live in 2008.
For how long can I expect support?
You need to look for a company that gives a long period of post-release support due to the fact that hardware and operating systems keep changing and your app may need to be tweaked when these changes take place.
What do you plan with the development?
The answer to this question will demonstrate if they will be doing a thorough job and if they have a workable plan.
When can I expect communication?
You need a company that keeps communications open for the duration of the mobile phone application development process.
Will you be aiding in the marketing of the app?
Obviously you will favor a company that will also help in marketing your mobile app when the mobile device application development is over and done with.
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