(However it is possible connect to only Wi-Fi. when connect 3G/4G,usage can't be confirmed.)
It is possible to download APK from here.
Set Account,password as the same ID,password with PPTP.
Port is 143.Set SOCKS Type as SOCKS 5.
After set it,please return to 1 screen.
(There are something that items of Proxy type don't change in Manual, just in case, display SETTINGS again and confirm it.)
Tap OFF of LOG screen and change it to ON and connect it.
When display warning screen that creates VPN connection in Drony, please check it and push OK.
If communication history is displayed by the minute by connecting proxy in LOG screen, complete connection.