#8 Code *#21#
Just press *#21# on your mobile phone to find out if your calls, messages and other data are being diverted. The status of different type of diversions along with the number to which the information is being diverted to will be displayed on the screen
#7 Code *#62#
This code will help you to find out where calls, messages, and data are being redirected to if it seems that no one can get through to you. The chances are that the voice calls are being redirected to one of your cell phone operator’s numbers.
#6 Code ##002#
This code can be used to switch off all the forms of redirection from your phone. You can use this before you have to use roaming so as to ensure that no money would be taken from your account for calls that are redirected by default to your voicemail.
#5 Code *#06#
Use this code to find out about the IEMI number. It stands for International Mobile Equipment Identifier, this number can be used to trace your device if it is stolen.
#4 The James Bond Code
It is the special code that can allow someone to track your location and will also help in determining if someone is following you. For this, you need the utility netmonitor. Type in one of the following codes:
for iPhone: *3001#12345#*
for Android: *#*#4636#*#* or *#*#197328640#*#*
#3 Use Anti-Virus Software
It goes without saying that you must use an apt anti-virus software on your phone and check it time to time for any viruses.
#2 How do the secret services listen in?
Well, the national security agencies now cooperate with cell phone operators, who often provide the former with access to information on any of their customers if they have a warrant from the court. The data of last three months is given out. Further, since people don't reveal much information on the phone, the bugs are installed in the home if someone secretly wants to listen to your information. Radio wave detectors can be used to work out whether such bugs are present in a building.
#1 Protecting Yourself
Go for the messaging apps that are totally secured and are completely closed to outsiders, such as Telegram, Chare, Wickr, or Signal. Further, don't put up personal information on the social media and avoid installing apps and programmes from unknown sources.