Is there a way to block apps from accessing internet in Lollipop?

I did some research on internet and most of the articles related to this topic are either outdated or suggests using some kind of another app.

I want to block internet access to apps I've installed without installing any other app or firewall. I was wondering whether there are any inbuilt settings in Lollipop which has this feature?

Basically I am worried that apps like Clean Master, etc. would be snooping around my msgs, contacts lists, pics and sending them to their servers.

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No internet on my 6P while on a call

Just got my 6P today, activated it on Verizon, and noticed I have no internet access while on a call. upgraded from a Galaxy S4 which was able to do both at the same time. Any ideas?

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Broken internet on stock

The problem is that when the network settings are auto GSM / WCDMA / LTE doesn't work an Internet connection and when are set to auto GSM / WCDMA internet connection returns. The problem occurred on the 20D and 20B. At the CM13 everything works fine. I've tried to replace the list of APN but didn't help.

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Internet connectivity issues

Does anyone have a problem with their mobile data sometimes not working? For example sometimes when I launch Google maps and go to search it will say "cannot connect to Google maps, try again later." I then have to close and reopen the app a few times before it connects. This also happens to my reddit app where I have to refresh a few times before it detects I have a connection.

I'm currently in the US on t-mobile. I tested and have received this problem with stamina mode on and off.

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