how to mount android samsung tab 3 on fedora 20

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As @yanglifu90 said, connect them with the USB cable you got from Samsung. If you don't have one, look for a "USB cable to Micro-USB cable" on Google. After connecting, there should be a notification. In KDE, the notification is on the bottom right, and in GNOME, it's in the bottom middle. Click open with File Manager, and you should be able to access the files from your computer.

However, if this does NOT work, you have to manually mount it by using the command mount [DEVICE] [DIR_TO_MOUNT]. The most common device is /dev/sdb1, but you can check it by using sudo fdisk -l. Choose the one with your phone name. Then, create a folder in your home directory (or wherever you want to mount it with mkdir [DIR_NAME]). Last, execute the mount command like this: mount /dev/sdb1 /home/USERNAME/mountdir.

For more information, refer to here. That is an Ubuntu question about mounting USBs, but it should work for phones as well.

Hope I helped.

You can simply connect them with an USB cable.