Windows phone 7 Apps in new Windows phone 8 OS version - windows

I have developed a windows phone7 application and its target windows phone OS version is 7.1.
The problem is, I saw in some Blogs saying that windows phone 7 apps are not working with new windows phone 8. So I would like to know if my app works in windows phone 8 as well.
Therefore what's the best way to test if my app works in the new windows phone OS version 8.
Thanks inadvance...!!!!

Download the Windows Phone 8 SDK and deploy your .xap to it and try.
http://dev.windowsphone.com/en-us/downloadsdk
They do work in WP8, however will not have as good performance.

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Developing Windows Phone App on Windows 7 OS

I'm developing a windows phone app. I'm using Windows 7 OS.
Which Visual Studio version should I use and also which Windows App version should I target?
Can it be WP7.1?
And also, I would need to use WebView. Is WebView available in 7.1? Or is there any other alternative of WebView in WP7.1?
I've gone through many articles but still unable to decide.
I highly recommend not to develop against the Windows Phone 7.1 API. It's outdated for more than three years now. You can generally install the Windows Phone 8.0 SDK on a Windows 7 system: How to Install Windows Phone 8 SDK on Windows 7
The results will satisfy you and your users more than a Windows Phone 7 app.
The mobile app market turns really fast. Much faster than the desktop application market. You should consider to do the free update to Windows 10 in order to be able to create Windows Phone 8.1 apps. Windows 10 Mobile is about to come this year. It supports the Universal Windows Platform so developers only need to develop an app onnce and run it on desktop PCs, phones and other Windows 10 devices. If I started a new app now I'd definitely create a UWP app.
Don't waste your time developing apps against an outdated API. Maybe you can still develop Windows Phone 7 apps now. But you'll probably don't get them into the stores in the future. It's just a matter of time when Microsoft stops developers to publish these old apps.

Do I need to code Windows 8 RT and Windows Phone 8 hybrid app seperatly?

I am developing windows 8 RT app using phonegap technology but now my client wants app support for WP8, IOS and Andriod. So my question is that Do I need to change recode for other platform or I can just export it for other platforms?
build.phonegap.com service doesn't support windows 8 RT build.
I am just confused in Windows 8RT and WP8 phonegap technology support.
Update:
Actually I am coding it for Windows 8 RT using cordova. My question was Can I use same code for IOS, Android and Windows Phone 8?
Windows Phone RT, are the new 8.1 apps, based on new tools and libraries.
They share more common feature with Windows 8.1 RT apps, than its predecessor (Windows Phone 8 Silverlight) and provide new APIs. There is still support for Windows Phone 8.1 Silverlight apps, although they are different from Windows Phone 8.1 RT.
Your might want to edit your description as it is not very clear, you say you develop a Windows 8 RT app (thats a Windows 8.x app, not a Phone app), then on the next line you mention
that build.phonegap.com service doesn't support windows 8 RT build.
Do you develop for the tablet or for the phone?

Will apps developed for WP 7.1 work on WP8?

I have already developed an app targeting Windows Phone 8, but it doesn't work on Windows Phone 7.5. To get it working on both platforms, I have decided to target Windows Phone OS 7.1 via Microsoft Visual Studio 2012 instead.
Will my app works on both WP 7.5 and WP 8 if I target WP OS 7.1 in VS 2012?
Windows Phone applications are forward compatible. This means that applications built for Windows Phone 7.x should work on Windows Phone 8. However, this is not a guarantee. Some applications may not work properly and you should definitely test your application on Windows Phone 8 devices.
You can also maintain two versions of your application: one for Windows Phone 7 and one for Windows Phone 8. You publish both versions as one application so that users of each device can get the best application for their device.
You can upgrade Windows Phone 7 project to Windows Phone 8 project, but you cannot downgrade. The best thing to do is to create a new Windows Phone 7 project and move all files from the WP8 project to the new one.
yes your app will work on both paltforms..
if you develop an app for wp8 then it wont be able to run on wp7.x but vice versa will work fine but it wont be able to use the new features introduced in wp8
WP 7.1 (sdk) == WP 7.5 (consumer designation) and yes, WP 7.x apps work on WP 8 devices.
Just for clatification, WP8 and Windows 8 are two different things. If you have a Windows 8 app it will not run on WP 8 or WP 7.x.
Yes u can develop app that will target both platforms refer following link for detail...
http://msdn.microsoft.com/en-us/library/windowsphone/develop/jj206997%28v=vs.105%29.aspx

SDK/Tools to Develop a New App on Windows Phone Platform for WP 7, WP 7.5 , WP 8 devices

I am new to Windows Phone Development Environment, looked around on SO but couldn't find a clear answer to the question I have.
With Windows Phone SDK 8 publicly available, and new Windows Phones getting good reviews, one of our Clients is looking to launch their app on Windows Phone Platform as well (they already have it on iPhone). The app is pretty simple. Obviously Client would like their app to be compatible and available to as many as possible users/devices - WP7, WP7.5 and WP8.
Question is - what SDK version should I use to develop this app? Currently I have Windows 8 with 64-Bit, VS 2012 Express and Windows Phone SDK 8.0 already installed and ready to go for development. So if develop app using above tools, will it run on all the devices with WP 7,WP 7.5 and WP 8 on them?
What is a good approach to develop a brand new Windows Phone App that would run on WP 7,WP 7.5 and WP 8 Devices.
The complete answer is on this MSDN page:
Windows Phone versions
Basically you can create application targeting the WP7.5 platform and it will run on all current Windows Phone devices, or you can target only Windows Phone 8, then it will run only on new WP8 devices, but when targeting this newer platform, you can use broader set of APIs and features.
When you create new project, you are asked to choose between Windows Phone 7 and 8.
WP7 app runs in old and newer phones, but WP8 app runs only in WP8.

Windows Phone Mango vs Windows Phone 7

I am new to Windows Phone development. When I searched on the web looking for code samples for windows phone, sometimes I saw there were projects for Windows Phone Mango. Would someone tell me the difference between Windows Phone 7 and Windows Phone Mango?
Mango was indeed the codename for the Windows Phone 7.5 update. There are a lot of new APIs and features in Windows Phone 7.5 and it brought with it a new SDK (version 7.1). Apps targeting the Windows Phone 7.0 SDK work just fine under 7.1 but apps targeting the Windows Phone 7.1 SDK require the Mango update to run.
The Windows Phone site lists the new features in the Windows Phone 7.5 (Mango update) and MSDN lists the API changes between the 7.0 SDK and the 7.1 SDK.
Mango was the code name for Windows Phone 7.5. The only difference you're going to see if perhaps some updated code samples with Mango tutorials.
there is nothing for you to worry about.
whatever works for pre-mango will work on mango.
therefore most code will works.
and you would only develop for 7.5 aka mango because all existing phone is upgrade-able to mango and phone running 7.0 won't be able to access the marketplace as microsoft had forced everyone to upgrade to 7.5

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