android device manager to find phone


My wife and I share a data plan.  I have both phones set up on android device manager so that if we misplace our phone/s we can locate them from our computer.  We have been turning off our "mobile data" at times to conserve on data usage.  I noticed that if my wife's mobile data is turned off, androic device manager cannot find her phone.  But if mine is turned off, it can still find it.  Why is this so?

Wife's phone samsung s4 mini

my phone samsung s5


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