If your phone all the time getting hot, and sometimes it's hanging, it's possible that malware is running in the background. A mobile device that runs hot could be infected with malware since the program will constantly run in the background.
New unknown applications
When the unknown application appears on your phone, or strange messages are sent to numbers in your address book, you may have been hacked. When hackers take control of your device, things will start to look disordered.Hackers often break into devices to load malicious files or encrypt personal data for their benefits.
Ways to prevent future hacking
Create strong passwords
Don't use common information about you, as a surname, name, address or anything somebody might be able to guess.
Use only official Apps
Only buy applications from the official App Store. External Apps are risky and cause problems.
Keep your phone updated
Sometimes you ignore those notifications to update your software. Don't skip it! You should update your software as soon as possible. Software updates are not always about new features, most of the time they also contain bug-fixes and performance.
Be Wary of Public Wi-Fi
Wi-Fi connection sometimes is our last resort, but be choosy of networks. By accessing a compromised one, cybercriminals could also access your personal information.
What can I do if my phone is hacked?
Use Antivirus Software
There are many good antiviruses programs designed for all operating system. Using this type of software protects again possible external attacks. Free versions are available, but better protection will be priced.
Delete unknown Apps
If you can't remember if you download this App and don't know what is it for, it will be safer to delete it. You will notice that these apps run in the background, even though you have never seen them or used.
A factory reset will restore the phone to the condition the manufacturer shipped it in. In the video below you can check how to do it.