Go to the bookshelf that is in the corner of your room, go to the "Password" section and choose the mobile symbol.

Effect	Password
Assorted fruits	6931-4107-8459
Giant swordfish	9355-7961-1257
Milk for a month	2110-3875-1734
Ocean gem	2938-4483-2376
Shiny gold veggies	0338-4272-1332