You 're right- now iam thinking seriously about rooting my phone . Just a question: if i root will i have full control of apps like killing them or stopping them from running in background ?and what is the safest root method? bacause iam afraid of bricking my phone.
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The engineer in me never likes to speak in absolutes so full no but you would be able to control things significantly yes. Right off the bat with root one can see more detail in battery usage statistics and wakelock detection using 3rd party applications like wakelock detector and GSAM battery monitor etc. That alone will help isolate things quickly.
Freezing unwanted applications with Titanium backup (I never uninstall, that's dangerous) can help a lot. Then there's greenify and boot managment applications that will help keep applications from starting up until you fire them up yourself. Greenify is most effective with Xposed framework installed that allows experimental features inside greenify to be turned on. Lastly there's applications like Amplify for Xposed that will allow you to block some wakelocks forcing things to operate at longer frequencies to reduce battery consumption on standby even more.
I find it an iterative and ongoing process whereby as applications update and my usage changes I'll revisit settings and adjust things. It takes patience, research and observation, otherwise there can be some serious lessons learned. Freezing system applications can impact stability if one's blindly going into Titanium and freezing things without knowing what they're for. There's no one stop guide but there are many posts out there of "safe" apps to freeze. The caveat there is, not everyone uses their devices the same way so what's unnecessary for one person may be a critical thing for someone else.
Rooting's the reason I went straight for a T-Mobile variant when the Note 4 came out last year. I'm on AT&T, but ended up opening a T-Mobile account, paying full for the phone, cancelling the account and using my AT&T SIM in it.
I'm not sure what variant you have so I can't say how to root it. Recommend checking XDA's forums. I haven't kept up with development for other variants but last i checked months back there was no permanent root for Verizon and AT&T variants.
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