I upgraded libmtp to 1.1.8, and it still doesn't work.
mtpfs -o allow_other ~/cellphone/
Unable to open ~/.mtpz-data for reading, MTPZ disabled.
Listing raw device(s)
Device 0 (VID=04e8 and PID=6860) is a Samsung Galaxy models (MTP).
Found 1 device(s):
Samsung: Galaxy models (MTP) (04e8:6860 ...