Why use vpn ?
simple... i have my server in different location. VPN is only chance to mount remote shares as local ones in order to user wrapper
as pptp is not save enough and does`nt start on boot with andorid , l2tp and 3rd soft for openvpn are options.
anyway, my l2tp vpns are working on iphone, android phones.... and of course with q10 DOESN`T
ps. of ocurse, one can also mount remote smb share on 445 tcp, but honestly, who does that ? of course, with q10 you will not do this directly, becayse q10 expects local netwrok location..