Developing an iPhone Apps that fulfills all the client expectations and in the due time, many companies wonder about it. Estimating the development hours and calculating the resources that would be used in that project, it's a tough job and most company?s work on the rough estimates.

Practicality of applications defers and the time required for their Planning- Designing- Developing and launching also differs on a large scale. Slowly and steadily iPhone has now become the most popular device in the market all over the world, and as the customer size is increasing, iPhone Developers are influenced to design more and more custom applications.

Typically there is a set timeline for the development process of the iPhone
Application:

* Planning & Architecture - 3.5 to 4 weeks
* Design phase - 3 weeks
* Development phase - 4-8 weeks
* Testing - 1 to 1.5 weeks
* Deployment phase - 6-14 days

Complete development cycle is centered on how well Planning is done and on how well the implementation is done on that.

Apple is well known for their product approach i.e., first they launch their products and then create the need for it. It give you a room to develop applications that can be customized easily to each individual needs catering specially and specifically according to their desire.

iPhone App Development currently cover four major verticals and there most popular Apps that are leading in market are:

- Business Apps
? Search Engine on your iPhone
? Accessibility to various Business reports, surveys, trends
? Email textual content to you mobile
? Money Management Tools
? Customer Detailed Database
? Calendar Services
? Windows Office Services

- Games Apps
? Brick games
? Puzzles
? Quizzes
? Strategy games
? Board games
? War games
? Multi/single players

- Entertainment Apps
? Radio Stations
? Movie Feedbacks
? Music
? Information about local events
? Cartoon Characters
? Fun and Interactive Applications

- Social Networking Apps
? Locating friends
? Wi-Fi networking
? Social networking games
? Weather tips
? Subscribing to events
? Horoscope
? Maps

IPhone OS 4 was launched dated "8th April" with more than 100 new features for increased capability for users. Users are delighted from the features such as multitasking, social gaming network, folders and many more. IPhone OS 4 has several dynamic features that will surely attract more users.