I find that if I have kio_mtp installed, mtp mounting of my Samsung Galaxy Note II does not work. As expected, when plugging in the phone, the notifier pops up a dialog. If I click on the Dolphin icon, a window opens, but the mount fails with the message "Could not read. Reason: unspecified error" or "Could not read. Reason: Could not claim the USB device." simple-mtpfs also hangs or returns errors (not reproducible). If I log out of KDE and log into a console, I can mount with simple-mtpfs. Also, if I uninstall kio_mtp (taking Amarok and Digikam with it!), I can use simple-mtp while logged into a KDE session.

Reproducible: Always

Steps to Reproduce:
1. Log in to KDE
2. Plug in phone using USB cable.
3. Click on Dolphin icon in notifier window.
4. Click on ">" next to "Samsung Galaxy models (MTP)". 

Actual Results:  
Hangs and gives error message.
Blocks use of simple-mtpfs.

Expected Results:  
Mounts device for read/write access or at least allows use of simple-mtpfs.

I'd be perfectly happy using simple-mtpfs from the commandline if I didn't have to blow away Amarok or log out of KDE to do it.