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CaseSingularPlural
Nominativeименительный · кто? что?телефон телефоны the subject: who or what acts
Accusativeвинительный · кого? что?телефон телефоны the direct object of the verb
Genitiveродительный · кого? чего?телефона телефонов possession, absence, "of"-phrases
Dativeдательный · кому? чему?телефону телефонам the receiver: to or for someone
Instrumentalтворительный · кем? чем?телефоном телефонами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?телефоне телефонах location and topics: in, at, about

Телефон is a masculine noun; the ending pattern above repeats across most masculine nouns, so every table you learn makes the next one cheaper.

Look up any other word in the Russian declension tool, see where телефон ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

12 forms is a table. Using them is a skill.

Slova drills телефон and every word like it with typed case endings, checked letter by letter.

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