Ahead of an expected "iPhone 13" launch, a new study published Monday suggests iPhone gets traded in at a higher rate than Android handsets, with nearly one-third of Apple trade-ins going toward the purchase of an upgrade.More than 35% of iPhone owners who purchased a new or used device over the 12-month period ending in June either sold or traded in their old model, according to a survey conducted by Consumer Intelligence Research Partners. About 30%, traded in iPhone, while just over 5% sold the device.By comparison, roughly 5% of Android owners who rid themselves of their smartphone hardware over the same period sold the device, while just over 10% traded it in.Read more