Every content and game provider knows how frustrating, difficult, cost and efforts consuming it is to deal with every different phone. I've already blogged on how similar J2ME or windows mobile phone is in reality very different, to the degree that if one is interested to ensure an acceptable user experience, they need to hold the phone in their hands.
Well some people aren't sitting on their hands. Device Anywhere from Mobile complete provides a good service that allows people to access various phones on specific networks. The phones seem to be physically in the country you need testing at. in fact, seems like a number of vendors partnered with mobile complete to provide a developer-friendly service. limited devices and network but great and economic service. (Sadly, the locations aren't always ideal in terms of network coverage: hey Mobile complete check your T-Mobile UK coverage!).
Mobile Distillery is also providing a similar service, and I believe so does Nexperience.