What it means
って marks a quoted statement in familiar speech. It can report what someone said, thought, heard, or asked, depending on the verb that follows; with 言う, it means that someone said the quoted content. The quoted content can be a complete sentence or a plain-form clause. In polite speech, と is normally used instead of って, followed by the polite form of the reporting verb.
Usage note
って is casual and is generally avoided in formal writing and careful formal speech. Do not confuse this quotation marker with the topic marker は or with the shortened form of という in other expressions.
How to use it
田中さんは来週来ると言いました。
Mr. Tanaka said that he would come next week.
田中さんは来週来るって言った。
Mr. Tanaka said that he would come next week.
Example sentences
兄は明日の朝に駅で待っているって言った。
My older brother said that he would be waiting at the station tomorrow morning.
先生は来週のテストは難しくないって言った。
The teacher said that next week's test would not be difficult.
友達は新しい図書館が静かだって言