I am making an app in which i need to find the location from background when userpress the home button, my app works fine on iPad2 and it gets updated,however its not working on iPhone, apart from iPhone 4, previous version of iPhone, is it possible to track update on that older version of iPhone leaving iPhone 4
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Since you mention that your app is running on iPad and iPhone, I assume that you are not asking about how to get the location when the app is running in background and that you are doing correctly as explained here.
As to the rest, your problem may have to do with background processing being only available starting from iOS 4.0.
So, more than the specific model of iPhone, what matters is the iOS version that is installed on your device (or if it can be installed).