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 n

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.