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It's fairly easy: run a webserver and upload the jad/jar to it. Host a page linking to the jad. Visit page from phone, and select that link.

The downside is you pay for the data on your cell plan.

Alternatively blasting the jar at the device over bluetooth is also likely to work.

I had an older nokia phone that i could do that with over bluetooth, but it would usually fail to recognize the certificates unless put on to it by the nokia software rather than standard obex.

Most of cheap nokias are fairly easy to do so, they come with a common micro usb port and that is all.

If you want my advice get an old JP8 Sony, so something like the K850, fast Java machine that only has some issues with optional apis and you can provision just the JAR via its USB cable or Bluetooth really easily. If you do get something running you can be semi confident it runs on the other JP8s