Notice if changes occur to your cell phone after you agree to allow someone to temporarily borrow it. That person might have borrowed it all day or for only a couple of minutes. They only need less than five minutes to install the spy software in order to eavesdrop on your conversations and messages with people. The rule of thumb is to never let your cell phone out of your sight or into someone else's hands.
Discover unexplained battery drain on your cell phone that either means you have a bad battery or that more activity is occurring than meets the eye. Replace the battery and check to see if that fixes the problem. However, if it doesn't and other questionable indicators keep occurring, then chances are it's not a bad battery and someone is using your battery to fuel their eavesdropping agenda against you.
The monthly bill significantly increases with text messaging, GPS and data usage being used more often than the owner recalls using it himself. This would be an indicator that a person's cell phone had been breached, especially if he can prove he used less of text messaging, GPS and data usage that is otherwise indicated in the cell phone bill.
Strange flashes of light are popping up on your cellphone and no one appears to be calling. This can happen if someone is using the spy software to log in to the cell phone. The spy software makes the lights flash because it is essentially calling the cell phone to log in without ringing and having a call.
Weird noises are often being heard on the cell phone. Whether it's gurgle, heavy breathing or fizz, chances are that the spy software is making that noise.
As mentioned above, there are ways of detecting and getting rid of spy software on the cell phone. One way of getting rid of the spy software is by purchasing an anti-spy program on your cell phone that can get rid of the problem itself. However, another way of getting rid of it is by going to a shop that sells and repairs old cell phones and have them reboot the cell phone back to factory default settings, which deletes everything saved on the cell phone.