First of all, gather all the ringtones you want to add to your Android device. By using simple audio program, you may create one by yourself. It is always better to get the ringtones in mp3 format.
After collecting all the ringtones in one particular folder, connect the device through USB cable. A message will appear at your screen, telling you about the USB connection.
If you are using Ice Cream Sandwich, don’t forget to enable the Android debugging. In simple words, you are allowing the device to share data with the computer.
Through file manager, open SD card or the mobile’s internal memory. There will be a special folder with the name of ‘ringtones’. In some devices, this folder may be named as ‘notifications’.
Copy the files from your system, and paste them in the ringtones folder on your device. It may take some time, depending on the size of the data.
Once the copying is done, unplug your device. Now you can enjoy new ringtones just by opening the Sound Settings. The list of available ringtone now includes those you have just added.