None of them.
An ounce (not once) will measure its mass. To get weight you need ounce-weight.
a postage scale or nutrition scale
I would measure its length in inches, its weight in ounces, and its screen brightness in lumens.
mm
The average weight of a phone book is around 2-3 pounds. This weight can vary depending on the size and thickness of the phone book.
Phone: 1-800-997-6917
Weight Watchers has a phone app that allows you to track your weight loss and measurements, which can be helpful to staying motivated and on track.
The average weight of a cell phone is 200grams - 800grams otherwise it's to heavy or light!
Probably inches or centimeters.
7 billion tonnes.
it depends on type of phone like before 2000 the phones were heavy but now phones are slim and weight like 100 g
Kilogram
Inside the mobile there is a small motor. Off the motor shaft is a small weight aligned off center. Signals are sent to the motor when ever a phone rings, spinning the weight and the virabtion is because the off cam motion of this weight.