Hy there Im a beginner hackerand i know alot of hacking apps...

But first of all I well start with the samsung phones>>

alot of u pepole says that samsung isnt good and the devise gets slow after while>>>You are wrong..

to phone>>go to numbers panel>>>write *#9900#

scrol down tell U see >Debug level disable/low<

click on it and choose high.
thats it now ur phone may restart and ur phone should be fast but when the phone start it may be slow and thats becuose of the memory..

and i have a seluotion for that I well post it late 

Samsung is the Best, i got a Galaxy S3 4G LTE from 2012, Rooted with custom kernel and Android 6.01 Pac Rom .. i swear to all that is scred, i never seen that phone slow down or freeze a single time .. just works flawlessly trough the years

very good i shall try this method