How does BlackBerry 8700g upload the ringtone downloaded from the computer to the mobile phone?

I use 87. First, you need to download a desktop manager, and then connect your mobile phone to your computer. Select USB as the connection type in Desktop Manager, and the mobile phone will be recognized by the computer. Then use the media manager in the desktop manager to transfer things directly to the mobile phone. However, it should be noted that 87 limits the file size, which cannot exceed1.8m. The file name cannot be in Chinese and needs to be changed to English or numbers. You can't ring the bell to put the whole song in. You need to use an MP3 cutter to cut off the parts you like.