There are several tell-tale signs that suggest your phone is being tracked, tapped or monitored in some way. The signs can be quite subtle but when you know what to look out for, they can also be glaring:
Unusual sounds during calls
If there are clicking sounds, static or distant voices coming through your phone during conversations it could be a sign that you’re being snooped on. This is not normal for today’s phones on digital networks. It’s a thing of the past and associated with old-style analogue networks. If you are hearing fragmentary voices, they may not be in your head; it’s a possibility that your phone has been tapped.
Decreased battery capacity
Another indication of a bugged cell phone is reduced battery performance. If a mobile phone is tapped it is recording your activities and transmitting them to a third party. This leaves a footprint in the form of increased battery usage and as a result the battery loses life faster. A tapped cell phone can also be constantly recording conversations in the room, even when the phone appears to be idle. And of course as a result it will chew through battery life. You can test this by using your battery in another phone of the same model and compare the results. Is your phone using more battery power than a phone of the same model and software? If so, it could be that your phone is bugged, or it’s defective in some way.
Phone shows activity when not in use
Is your phone making noises or lighting up its screen when you’re not using it? Call and message alerts to one side, your phone should be as silent as a sleeping baby when not in use. Does it also reboot for no reason at all? If so it’s possible that someone has remote access to your device.
Phone takes a long time to shut down
Before a smart phone shuts down it must complete any tasks that are processing. If your phone is transmitting data to someone it will have to complete the process before it shuts down. As a result if a phone takes longer than usual to turn off especially after a call, text, email or web browsing it could be sending information to a third party.
Battery temperature feels warm
A further indicator of a possible phone tap is the temperature of your battery. If the phone feels warm even when you haven’t used your phone it could be still in use secretly transmitting data. However this is only a potential sign.
Receiving unusual texts
Are you receiving strange text messages containing random numbers, symbols or characters? The remote control feature of spy software works by sending secret coded text messages to your phone and in some cases these can be seen if the software is not working correctly. If this happens regularly you could have a spy app on your phone.
Increased data usage
Some of the less reliable spy apps use extra data to send the information collected from your phone, so look out for any unexplained increase in your monthly data usage. The best spy software programs data usage has been reduced and will be almost impossible to spot but the poor programs will show significant data use.
Source: Bullgaurd.com