I have built apps for android using PhoneGap and have had no issues at all. Today I got a requirement to build an app that runs on android, iphone, windows mobiles phones, blackberry ( old and new he said - whats with that? ). So my question is are there any issues, hickups when building an app for all these platforms that uses location based data with phonegap? Like are there any sort of issues I could get into and should take in consideration before I take up such a project. 

Also any ideas about how could I test such an app as I do not have anything besides an android device do it would cost me a lot to buy these devices to test my app.

About the app: The app is a simple app that is supposed to find the closest 'x' to you.

Thanking you