In the past I have used a combination of tools: - Smartphne emulator developer edition (comercial) from yospace (http://www.yospace.com/spede.html)

- Two firefox extenstions: user agent switcher, wmlbrowser.

- You can find some more info. at http://wurfl.sourceforge.net/ . Their mailing list is pretty good too.

Yospace is really cool. thank you

What language are you writing your app in? If using J2ME, I would suggest checking out J2ME Polish to organize your builds across multiple platforms. There is a built in device database that lists most phones along with their supported APIs.

While it wont replace eventual real-world testing, it at least allows you to focus in on devices that support the specific APIs, form factors, etc that you need and ignore the ones which you do not.

The J2ME Polish GUI libraries are also excellent and work well across different devices.

thank you. That would be nice but it doesn't test the functionality from one operator to the other.

Got a budget? Check with centercode.com; they have a pool of volunteer testers, and can send out a survey to select users with the target phones on the target networks.

No budget? It's a really tough problem. Test where you can and ask for reports from other users. Offer something of value or interest for detailed bug reports from platforms you can't test yourself. There are only so many J2ME base platforms so you can group by those, but in the end you need to test on each specific device.

Not too bad centercode. Thank you Merlot.

i have not used this myself, but seems to be a good option (if claims are true):

http://deviceanywhere.com/index.jsp

if you try it, i would be interested in how you find the service.

Nice. but cost too much. Thanks for the link.