What is the easiest app to hack another cell?
Yes, hypothetically. If you mean to put a shell onto a phone in which you control it completely with 100% success... well no but an app that if you are an android phone and rooted is interesting is zAnti A great tool to screw with people. At it's most you can push them to your own site with an apk or whatever apple has and ask them to install it(not as unlikely as you would think). It can also be use for a mitm attack where you intercept the "internet"(packets) from them to their destination allowing you to session hijack (there is a pretty button in the app) or grab passwords (only in plaintext) so this might help with what you are looking for.
If you will think a little about these new new mobile phone following systems you will see that they "attack" your protection a little yet a few people don't concur. A few people say that it is a decent approach to monitor everything. Other individuals, similar to guardians, believe that they are a truly extraordinary approach to find their kids excessively check whether they are OK. Regardless, the feelings vary a considerable measure.
Another conspiracy theory is that the tracking systems in our cell phones will be able to store our every move and location in a database and then others will be able to see exactly what we do. This is appealing to businessmen who would pay tons of money to see where their customers are or where their enemies are. This will also help them advertise their products according to the places where the customers hang around.
This question is like "One application exist. Yea. Write an email in and you can get password just one click. Did you hear that ?"
Sorry but not exist and can't be in real world. That means an application have a zero-day exploit. Ok. So; why you want to waste your zero-day exploit in app-store or google-play just for free ?
Providers, quickly fix them. Just why you want this ? Just sell on deep-web or participate bounty hunt event ?
Sorry, in real world; if you one application said "You can hack this", actually hacking only installers.
Run Forest Run! Change mail your password!
Msfvenom, Metasploit are my favorite remote access programs there is a tool called TheFatRat that automates the creation of payloads and remote listen if you new to metasploit and Ethical hacking you can find various tutorials from the link below the site is for educational purposes only.
Their are no apps for hacking you can learn the terms of hacking by the app called ethical hacking but their are no apps for hacking you have to learn java, C++, Python for hacking into system and you also have to learn to create a virus