I finally succeeded in installing some java games to my Samsung E250 via bluetooth. I thought I would share the info on how I do it here because it seems to be a frequent unanswered question on various forums. You will need a *.jad and a *.jar file for your game.
1) Download SoftickPPP and Samsung Java Uploader.exe from here. Also JADmaker if required.
2) Install SoftickPPP according to this Polish website. I don't understand Polish, but the pictures tell enough of the story. Set up your bluetooth COM ports in the SoftickPPP bluetooth/serial settings. My Bluetooth COM ports are either 24, 25 or 26. I leave them all ticked.
3) Enter *#52828378# on the phone to access the Java Test Menu. Choose OTA type setting, choose Serial bearer OTA. Click select. (This seems to need to be changed back to GPRS bearer OTA for Samsung PC Studio to connect)
4) Start SoftickPPP. Click on cancel for the missing USBPort.dll error message. Accept bluetooth connections for DUN and Serial connections on the phone.
5) Choose 'Activate PPP' by right clicking on the icon in the taskbar. Accept connections on phone again.
6) Start 'Uploader.exe' and then add the required jad file. Leave the program open.
7) If you are not still in the Java Test Menu then enter *#52828378# on the phone again. Select 'Serial test', 'PPP Up', 'Bluetooth' on phone, 'Serial download'. My phone sometimes restarts at this point in which case I have to choose 'Shutdown PPP" in the taskbar icon and then re-activating it once the phone has restarted and then re-do step 7 after entering the Java Test Menu again.
A Java splash screen should appear with a progress bar showing the upload of the file. The game then starts automatically.