This app was mentioned in 8 comments, with an average of 4.00 upvotes
You don't need to install the apps. Once registered, you can connect via the browser, just like when you connect to a hotel's wifi.
http://flets.com/freewifi/step.html
But if you want to use an app and have Android phone, you can manage permission in Android easily (better than iPhone I'd say) using AppOps (https://play.google.com/store/apps/details?id=fr.slvn.appops&hl=en).
I used to have the same problem on my Nexus 4. The fix is downloading AppOps and disabling "Keep Awake" for Google play services. I'm not sure if it'll work for LG G3 but worth a shot. BTW, it needs root.
There are apps you can download to prevent other apps from accessing all those things they ask for. I use AppOps.
On Android 6.0 Marshmallow, there's a feature to do that. If you are running Android 4.3 or 4.4, you could try https://play.google.com/store/apps/details?id=fr.slvn.appops
App Ops, Guerrilla Mail.......
Thank you, just to clarify is it this app? There are two with the same name.
https://play.google.com/store/apps/details?id=fr.slvn.appops&hl=en
Thanks!