use vs wear

Use applies to tools, systems, or objects operated for a purpose, while wear applies to clothing, jewelry, or items carried on the body.

• use

  Operating a tool or a system.

  Most employees use a specialized software program to track their daily billable hours.

• wear

  Carrying clothes or accessories on yourself.

  The security guards must wear a dark blue uniform while they are on duty.

• Wrong: The construction workers wear heavy machinery to dig the foundation.→Right: The construction workers use heavy machinery to dig the foundation.

• Wrong: I have to use a suit and tie for the interview tomorrow.→Right: I have to wear a suit and tie for the interview tomorrow.

You use a phone; you wear a watch.