How many wires are in a phone line?

[valentena]

Four wires
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In a typical home, the telephone cables connecting your phones within you home contain four wires. red, green, yellow and black. They are used in pairs for each phone line you have.

[ChrisB]

There might be 4 but a phone only uses/needs two.
The line from the pole to the house is usually 2 wire.

[valentena]

Thank you so much for your kind response. Appreciate it.