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Samsung PM-A840
How Can I Download Ringtones To My Phone Using The USB Cable?
http://www.bitpim.org/
2. Connect Your Phone, Click on Edit>>Detect Phone or Edit>>Settings and select SPH-A840 as your phone, and select your COM Port [Should be under the active list as "Samsung CDMA Modem #X"]
3. Select "OK"
5. Click the "Ringers" tab.
5. Click "Add" above "Ringers" tab.
6. Select the MP3 you want and follow directions from there.