Here are the biggest warning signs that your phone may be hacked, along with the secret codes that can tell you more.

Forbes contributors publish independent expert analyses and insights. For many of us, our phone is an essential part of daily life, used for everything from social interaction to banking or working.

Phone hacked signs can appear subtly at first, such as rapid battery drain, unusual app behavior, or strange notifications. Other indicators include unexplained data spikes, pop-ups, or random system ...