How does a pilot switch from IFR to VFR mid-flight?
You simply tell ATC your request:


  A: DEXPL, request cancel IFR.
  R: DEXPL, roger, report VMC.
  A: DEXPL, we are VMC.
  R: DEXPL, IFR cancelled at 20. Squawk VFR, approved to leave frequency.