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It depends on the type of wire and what it's being used for.
The two most common types of phone wire, also called twisted pair cable are Cat3 and Cat5
Cat3 contains two twisted pairs (4 wires) most often coloured:
Green twisted with Red
Yellow twisted with Black
OR
White/Blue twisted with solid Blue
White/Orange twisted with solid Orange
Cat5 contains four twister pairs (8 wires) most often coloured:
White/Blue twisted with solid Blue
White/Orange twisted with solid Orange
White/Green twisted with solid Green
White/Brown twisted with solid Brown
Cat3 can carry 2 separate phone lines and Cat5 can carry up to 4, but can also be used to carry data.
A standard phone wire carrying 1 phone line will only use the primary pair being Green/Red or the White/Blue combination.
A phone capable of using two lines with a single wire may employ both pairs, the second being the Yellow/Black or White/Orange combination.
There is a polarity to the wires as well, known as Tip and Ring. If you find two types of wiring or using different colours, use the following to properly pair them.
Tip Ring
-----------------------------------
Green Red
Yellow Black
White/Stripe Solid
If you're going to be splicing these wires, its adviced to have no more than 3-4 wires twisted together at a time and properly capped, not just taped up with electrical tape, as it will not hold the wires together securely. As well, some terminal blocks and wallplates use screw down terminals, do not put more than 2 wires on a single terminal as the wires tend to break easily.
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