Messenger SCH-R631 apps via sd card or bluetooth

Okay I have a phone very simular to this. I have the Messenger SCH-R631. I'm couldn't find it's page, so I'm guessing I should come here. I am having a little trouble with apps. I want to download an app onto my phone through my computer. I don't have a usb cord so I can only connect through Bluetooth and sd card reader. I don't have internet on my phone so I can't download it through there. The file I want to save is a JAR file. Please if anyone can help me that will be great. I am willing to buy a usb cord if that is the only way.

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I'm not familiar with the os on this phone, but have you tried loading the jar file onto the sd card and opening it from the phone?

The phone inconveniently doesn't show any files other than the apps (but they don't have any settings or send options), pictures, videos, sound, text, ect. Theres no "other files" folder or anything. its very strict. so if i did put it on the sd card it would not show up. I realized i did have internet on my phone and tried to download it online but it would not download. I sent it to my old phone via Bluetooth through my computer, then sent it to my new phone via Bluetooth from my old phone. It started to download but it said "file is not supported", when it says differently on the website. The program the apps run on is called brew, but I can't access the brew files through my sd card to place it in. I recently bought an app from brew but i cannot find the file when accessing my phone through bluetooth or sd. The app i downloaded works fine though and apears on the app menu. so I am confused. I'm guessing this means the app I bought isn't a jar. file.