SquareTrade offers a gadget protection plan so it is jolly interested to know which phones it will have to pay out more to replace. Americans have spent over $6 billion on broken iPhones.
SquareTrade has put top-selling smartphones through a series of tests like dropping from five feet and submerging in water for 10 seconds.
Eight different factors are used to calculate the phone's durability like materials used for the front and back, weight and size.
The phones are scored from one to ten, with a higher score meaning the phone is more likely to break.
Last year, the iPhone 5 had a score of five, but this year, the iPhone 5S received a score of 5.5 and the iPhone 5C received a score of 6.
Ty Shay, chief marketing officer at SquareTrade had expected that at least one of the new iPhone models would up its game, but it was the Moto X that proved most forgiving of accidents.
It had been expected that the 5C would be less durable than the 5S because of its plastic case, but if you want an iPhone to last it is probably better that you hang onto the iPhone 5.