It's possible to install J2ME Midlets in the Nokia 2660 cellphone? The installation of the Midlet is via bluetooth or physical cable?
If testing for a app that'll be available for public download you should test OTA (Over The Air). This way you'll be testing it in the same way your users will be using it.
OTA basically means put-it-on-a-server-for-download. You'll need a server setup with the correct MIME types; but that's a different question.