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

    Jul 25, 2014
    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

    Jul 3, 2014
    Birmingham, AL
    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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