Nope, no way its terminal velocity is 100 MPH.. not a chance in hell.
Human being’s terminal velocity is about 120 MPH.
Wind resistence on a tumbling Iphone which ways about 1/2 a lbs, with the surface area it has, no way on God’s green earth in free fall it got anywhere close to 100 MPH.
I am assuming its TUMBLING, which it almost certainly would be.
There is absolutely no way a 1/2 lb item with a suface area of an iphone tumbling and falling freely got anywhere near 100MPH.. Only time it would have been moving that fast was probably for a few seconds after it exited the plane and it bled off the velocity it inherited from the jet.
Not a chance in hell it fell to earth at anything close to 100MPH.
This sounds like a perfect test for MythBusters !