i have a sony ericsson k800i, i have the USB cord, i would like to put music on my phone but not sure of how i would do this, i have a mp3 player on my phone. could someone please help me

It should be pretty easy, if you are slightly computer savvy. You should have received a disc with your phone but if not, you might have to check out Sony Erricsons website for a program to download. Its as easy as starting up the program and following the prompts. It should tell you to plug your phone into the computer using the USB cord. Then you probably have to drag the music from your computer folder to the phone. The program should help you otherwise call Sony Ericcson technical support or check out their website. Hope this helps. This is a simple explanation but it might help you.

I also have a Sony Ericsson K800i.

Note: Make sure first that SE K800i supports the music format that you're going to transfer (Supported formats: MP3/AAC/MPEG4 -- I have not yet tried WMA)

Follow these steps to transfer music on your mobile phone:
1. Connect USB cable to the USB port of your CPU.
2. Connect SE K800i to the USB cable.
3. You will be prompted with three options on your mobile phone. These are "File transfer", "Phone mode", and "Print". Just select "File transfer".
4. If you're using Windows OS, right-click "start" on the taskbar and then select "Explore".
5. If you want to save your music on the phone's internal memory, go to "PHONE (X"; if you want to save your music on Memory Stick Micro (bought separately), go to "PHONE CARD (X". Note: X represents the letter of your drive.
6. PHONE (X and PHONE CARD (X have subfolders "Music" and/or "music". Just "copy and paste" your preferred music on either of these folders.
7. Safely remove the USB cable.

Optional steps to follow:
8. Go to "Music player".
9. Select "Playlists".
10. Create "New playlist" by browsing the folder where you saved the music. (probably, "Music" folder)

I also have a Sony Ericsson K800i.

Note: Make sure first that SE K800i supports the music format that you're going to transfer (Supported formats: MP3/AAC/MPEG4 -- I have not yet tried WMA)

Follow these steps to transfer music on your mobile phone:
1. Connect USB cable to the USB port of your CPU.
2. Connect SE K800i to the USB cable.
3. You will be prompted with three options on your mobile phone. These are "File transfer", "Phone mode", and "Print". Just select "File transfer".
4. If you're using Windows OS, right-click "start" on the taskbar and then select "Explore".
5. If you want to save your music on the phone's internal memory, go to "PHONE (X"; if you want to save your music on Memory Stick Micro (bought separately), go to "PHONE CARD (X". Note: X represents the letter of your drive.
6. PHONE (X and PHONE CARD (X have subfolders "Music" and/or "music". Just "copy and paste" your preferred music on either of these folders.
7. Safely remove the USB cable.

Optional steps to follow:
8. Go to "Music player".
9. Select "Playlists".
10. Create "New playlist" by browsing the folder where you saved the music. (probably, "Music" folder)

I also have a Sony Ericsson K800i.

Note: Make sure first that SE K800i supports the music format that you're going to transfer (Supported formats: MP3/AAC/MPEG4 -- I have not yet tried WMA)

Follow these steps to transfer music on your mobile phone:
1. Connect USB cable to the USB port of your CPU.
2. Connect SE K800i to the USB cable.
3. You will be prompted with three options on your mobile phone. These are "File transfer", "Phone mode", and "Print". Just select "File transfer".
4. If you're using Windows OS, right-click "start" on the taskbar and then select "Explore".
5. If you want to save your music on the phone's internal memory, go to "PHONE (X"; if you want to save your music on Memory Stick Micro (bought separately), go to "PHONE CARD (X". Note: X represents the letter of your drive.
6. PHONE (X and PHONE CARD (X have subfolders "Music" and/or "music". Just "copy and paste" your preferred music on either of these folders.
7. Safely remove the USB cable.

Optional steps to follow:
8. Go to "Music player".
9. Select "Playlists".
10. Create "New playlist" by browsing the folder where you saved the music. (probably, "Music" folder)