Type in one of the letters of the key in your calculator, then turn it upside down, and you should be able to read the words below.
Key
0 = O..........1 = I..........3 = E..........4 = h..........5 = S..........6 = g..........7 = L..........8 = B

BE GO HE HI IS LO SO BEE BEG BIB BIG BOB BOG BOO EBB EEL EGG EGO ELL GEE GEL GIB GIG GOB GOO HIS HOB HOE HOG ILL LEE LEG LIE LOB LOG LOO OIL SEE SHE SIS SOB SOL ZIG ZOO BEES BEGS BELL BIBS BILE BILL BIOS BLOB BOBS BOGS

BOO BOOS BOSS EBBS EELS EGGS EGOS ELSE GELS GIBE GIGS GILL GLEE GLIB GLOB GOBS GOES GOGO GOSH HEEL HIGH HILL HISS HOBO HOES HOGS HOLE HOSE HOSS IBIS ILLS ISLE LEES LEGS LESS LIES LOBE LOBO LOGE LOGO LOGS LOLL LOSE LOSS OBOE OGLE OILS OOZE SEES SELL SHES SHOE SHOO SIGH

SLOB SLOE SLOG SOBS SOIL SOLE SOLO ZIGS ZOOS BEIGE BELIE BELLE BELLS BEZEL BIBLE BILGE BILLS BLESS BLISS BLOBS BOILS BOLES BOOBS BOOZE GEESE GILLS GLEES GLOBE GLOSS GOOSE HEELS HEIGH HELLO HILLS HOLES HOSES IGLOO ISLES LIBEL LIEGE LISLE LOBES LOESS LOOSE LOSES OBESE OGLES OOZES SEIZE SELLS SHELL SHIES SHILL SHOES

SILLS SIZES SLOGS SLOSH SOILS SOLES SOLOS BELIES BELLES BESSEL BIBLES BILGES BOBBIE BOBBLE BOGGLE BOGIES BOOGIE BOOZES BOSSES GIGGLE GLOBES GOBBLE GOGGLE HISSES HOBBLE HOLIES IGLOOS LESSEE LILIES LOOSES LOSSES OBLIGE OBSESS SEIZES SHELLS SHILOH SIEGES SIZZLE SLEIGH BELLIES BESIEGE BOBBLES BOGGLES ELEGIES GIGGLES GLOSSES GOBBLES GOGGLES HOBBIES HOBBLES LEGIBLE LOBBIES OBLIGES SLEIGHS