How do you convert a wired phone to a modular plug?

To convert a wired phone to a modular plug, you'll need a modular phone jack and some basic tools. First, carefully open the phone to access the internal wiring. Identify the existing wires and connect them to the corresponding pins of the modular jack according to the standard wiring scheme (typically using the RJ-11 configuration). Finally, secure everything and test the phone to ensure it works properly with the new modular plug.