Answer:
Try resetting your device.
Explanation:
In order to send and receive iMessages to your iPhone, iMessage must be enabled. By doing this, you will associate your phone number with the email address used for your Apple ID or iCloud account.
 
        
             
        
        
        
Explanation:
Hardware is useless without software because the machinery will not and cannot do anything without programming to tell it what to do. Without an operating system, the computer can't do anything. Without other software, like Microsoft Office, you can't type anything or listen to music or watch video or anything
 
        
             
        
        
        
Answer: The goals of computer security are to protect computers and users from data theft or loss as well as damage to any part of the computer.
Explanation: Common means of achieving computer security are firewalls, anti-virus software and this can fail due to hardware problems  or  
weaknesses that prevent malicious attacks.
To answer this question, think of a time when you experienced any one of these. For example, personally, I was once an unfortunate victim of a general malicious attack that took advantage of a weakness in my anti-virus software. After clicking on a link on a dodgy website, a virus was installed on my computer. My computer finally crashed, without any hope of restarting it. I lost all my data and I had to buy a new computer.  This was a malicious attack.
However, sometimes people can be specifically targeted to steal their data or monitor their activities.