It is a very bad experience in my life. When I bought this phone problems starts continuously.
Right on first day tha back button, app killer and home button stopped working,
Even installing all updates didn’t help,
The problem was solved the resetting the factory setting without restoring contents from previous phone.
There is another problems in data security when you restore from previous phone, somehow was my credit card has hacked while the restore has in progress and I was billed approximately 55k in multiple international transaction and the issues is still under investigation by credit card company, so beware when you restore from previous phone.