Honestly yeah I have an iPhone and it's awesome. Smooth as melted chocolate and you never worry about viruses

Try closing other apps. Sometimes when you switch apps by using the back button it only switches windows and the other apps you have opened are still running in the background. These apps consumes memory/ram which normally slows down your phone.

Uhh android phones get viruses and stuff. I guess it's better to go to the store and ask

Guess it's an old phone