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On your phone you can install an app of any developer, if this developer added your phone to his own device list and your phone is included in the provisioning profile of this developer.<br />
<br />
You can install any app from the AppStore.<br />
You can install an enterprise app - an enterprise may have an enterprise account on Apple and may distribute own apps.<br />
You can use TestFlight to distribute apps, for example, for beta-testers. Also it is one of the features in iOS 8.
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On your phone you can install an app of any developer, if this developer added your phone to his own device list and your phone is included in the provisioning profile of this developer.

You can install any app from the AppStore.
You can install an enterprise app - an enterprise may have an enterprise account on Apple and may distribute own apps.
You can use TestFlight to distribute apps, for example, for beta-testers. Also it is one of the features in iOS 8.

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Thanks- Maybe i wasnt clear-<br />
This is what i want to happen &nbsp;i click a link on my website and open a already installed &nbsp;app &nbsp;on my iphone . <br />
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&lt;a href=&quot;link to iphone app&quot;&gt;CLick here&lt;/a&gt; <br />
<br />
Again I dont have any access to developers device list or the schema &nbsp;link call
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Thanks- Maybe i wasnt clear-
This is what i want to happen  i click a link on my website and open a already installed  app  on my iphone .

<a href="link to iphone app">CLick here</a>

Again I dont have any access to developers device list or the schema  link call

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Can you link to an IOS app install on iphone from a web url &nbsp;of an app that you didnt develop or own? I understand you can do this if you create the app by defining the URL Scheme and calling it seems to be pretty simple. But What about if you dont own the app?
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Can you link to an IOS app install on iphone from a web url  of an app that you didnt develop or own? I understand you can do this if you create the app by defining the URL Scheme and calling it seems to be pretty simple. But What about if you dont own the app?

Link to an IOS app from URL

Mobile web development, also known as responsive web design, is an approach to web design aimed at crafting sites to provide an optimal viewing and interaction experience—easy reading and navigation with a minimum of resizing, panning, and scrolling—across a wide range of devices (from desktop computer monitors to mobile phones). A site designed with RWD adapts the layout to the viewing environment by using fluid, proportion-based grids, flexible images, and CSS3 media queries.

Responsive Web

iOS is a mobile operating system developed by Apple; it is a derivative of the Mac OS X desktop operating system, with which it shares many (but not all) common frameworks and other components. These include Cocoa Touch, the Mach/Darwin/XNU kernel and code from the Berkeley Software Distribution (BSD). Each iOS application runs in its own secure sandbox to prevent altering other applications, the operating system, or any other data.

The iPhone is a smartphone made by Apple Inc. It and the iPad, along with several other mobile devices from Apple, run on the iOS operating system, which has its own topic, as does the iPad for device-specific questions. Native iOS applications are written in Objective-C or in Swift using the Cocoa Touch frameworks or HTML5 compiled with the help of a package manager such as Adobe PhoneGap; a common IDE is Xcode.