Wifi Calling...Does it turn off or put to sleep the cellular radio?

Discussion in 'iOS 9' started by tresmith, Sep 3, 2015.

  1. tresmith macrumors 6502

    Joined:
    Jul 25, 2014
    #1
    I'm just curious to know how exactly the handoff process works between wifi and cellular during a call.

    When you are on wifi is the cellular radio "turned off" or put in a sleep mode, so to speak?
     
  2. aldrinjtauro macrumors regular

    Joined:
    Jul 3, 2014
    Location:
    Birmingham, AL
    #2
    The cellular radio is never turned off unless you're in Airplane Mode. Instead, if you're on Wi-Fi, the cell radio turns off the data connection and drops its IP address. But it's still technically on an LTE or HSPA or 3G connection.
     

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