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Can windows phone store apps run in tablet?

I am developing new windows phone 8.1
[RT] application working fine , but now my client want to give support to tablet also . Does my application work in tablet or I have to create a universal project ?
Please help me out for this .

Windows Phone 7.x or 8.x apps do not run on Windows 8/8.1/10 "out of the box" - you need to either have a universal app, or share your code (for example as a portable class library) to allow it to also run on the desktop variant of the OS.
If you want your app to run on over vendors tablets (such as Android or iOS) there are solutions that allow some code sharing, but again, you're looking at supporting another codebase to achieve this.

Directly reading sensor data by paring Band 2 and PC (windows 8.1) still needs an emulator

I have to read sensor data from Band. I did search and became more confused. It seems there is a way to directly read data from Band by connecting with the desktop (windows 8.1) via Bluetooth. When I run a sample, it returns an error message like ‘deployment failure. No windows phone is detected’.
Is it possible to read sensor data from Band 2 this way?
Software environment: VS2015 community-Blank App (Universal windows);
Hardware environment: Band 2, desktop;
Pairing Band 2 with desktop via Bluetooth;
No windows phone and windows phone emulator get involved. Microsoft Health app is not used.
If yes, can I find sample code online?
Or it should be this way?
Software environment: VS2015 community-Blank App (Universal Windows 8.1), windows phone emulator, Hyper-V is required as well;
Hardware environment: Band 2, desktop, windows phone;
Pairing Band 2 with windows phone via Bluetooth;
Run the sample on the windows phone;
Both windows phone and windows phone emulator get involved.Microsoft Health app is not used.

You can use the Band SDK in one of two ways:
Within a Windows Phone 8.1 or 10 (Universal) application running on a Windows Phone, where the Band is Bluetooth-paired to the phone.
Within a Windows Store 8.1 or 10 (Universal) application running on a Windows PC, where the Band is Bluetooth-paired to the PC.
The Band SDK is the same regardless of the hardware used, so any of the samples should be fine.
Note that you cannot use the Band SDK when your application is running in the Windows Phone emulator nor when the application is running in the Windows simulator.

Windows Phone - Get User ID

I need to store and share a user's list of favorites across a Windows Phone 8.1 Silverlight app, and a Windows 8.1 RT app. I have been using Roaming Settings up to this point, but it doesn't work for all connected devices. I have tested my app across a few devices and it syncs for most but not all devices. I have also received some user complaints about this too.
So instead I want to store a user's list of favorites in Azure Blob Storage, with the key being an anonymized user ID. But I can't seem to find any way of determining a user's ID. I have found information about DeviceUniqueId and there is ID_cap_identify_user capability in the manifest file for the Silverlight App (but not for the RT App) but I can't find any documentation on how to utilize this. Any help here would be apprciated.
PS - Does anyone have any theories as to why Roaming Settings isn't working correctly on some devices?

There is an UserInformationClass, BUT take note if you want to use it in reference to windows 10!
If you have a Windows 8 app that uses the UserInformation class, you
should migrate your app to the Universal Windows Platform (UWP) and
access the User class instead. Universal Windows Platform (UWP) apps
that access user information are now expected to declare a new
capability, uap:userAccountInformation, and call new APIs,
Windows.System.User.FindAllAsync and User.GetPropertiesAsync, to get
the data.
There is also an MSDN example on how to use it: https://code.msdn.microsoft.com/windowsapps/Account-picture-name-sample-912baff1

Can we get the list of installed apps programmatically in our app in windows phone 8?

Can we get list of app installed in phone from my app?
I have seen many question here all are saying not possible and few answers saying with live id they're access our App history and showing.
But see how this apps working :
http://www.windowsphone.com/en-us/store/app/app-folder/7d2e7de3-95e7-4143-8a9d-aedf8c3f901e
http://www.windowsphone.com/en-us/store/app/app-folder/1a248adb-1429-45ea-a507-f3d5f4cad58c
And Can we open any app that we installed in our phone from our APP?
For example : - My app need to open "Bing Weather" app.
Thank you
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No, you can't. That's not possible.
Both apps you linked to are not standard-apps. Look at publisher names: Nokia Corporation and SAMSUNG ELECTRONICS Co, Ltd.
They have different kind of access to system resources then you have as a developer using public Windows Phone API.

Emulate a specific WP device?

I'm creating an app for Windows Phone 8 that spits out a 1-10 score rating your phone's performance (Like the Windows Experience Index) but for windows phone. The app is basically done, but due to how this app works differently from device to device, I would like to emulate multiple devices in the WP emulator. I own a HTC 8X, and I know my app works fine using that, but how can I emulate another device, such as a lumia 920, using the Windows Phone emulator?

You can't emulate a specific device in the emulator. As a workaround, you can use the Remote Device Access provided by Nokia. It will allow you to test the app on a large panel of Nokia phones. Unfortunately, I'm not aware of similar test platforms from other constructors.

In the emulator you can test only diferents resolutions and size of rams, i think it would be two of the things you should "scan" in your app so it can help you to test your app

You can test for different resolution and size by this way
But when you need to test mobile like lumia 920 which runs in WP8 os. You need to have WP8 SDk installed in VS2012.