Auto enable data connection when app used and disable when closed

Hello,

I search an application for my Samsung S2 - I9100. Im using specific application which need internet mobile connection (every other app is block by Droidwall). Ideally when app need connection so data enabled after close data disabled.

Does exist some app please? Or setting in android?

Im using CM 12.1

sorry for my english

thanks

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Has anyone used this phone on Verizon?

My wife and I are thinking of switching to Verizon as the AT&T service here is pretty bad. Ive seen some webpages that are kinda iffy on this phone since Verizon doesnt sell it directly. So, id like to hear if anyone has used this with Verizon and if they had any issues with it. Thanks.

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Can executable RUUs be used to downgrade?

There's something that I'm a bit unclear on when it comes to RUUs

Let's say that I'd like to try out the latest Marshmallow release without waiting for the OTA and use the HTC-provided RUU .exe (3.35.617.12)

I'm on a T-Mobile branded M9 and would like to keep WiFi Calling and Visual Voicemail. If I find that I am unable to use these features in the non-branded HTC MM release, will I simply be able to use the T-Mobile branded RUU .exe (2.11.531.19) to revert back or will I be unable to as it's an older version (Android 5.1)

I'm currently still locked and S-ON

I seem to remember downgrades not being possible on my M7 once the hboot was updated to a newer version, but am a bit confused about the specifics of the M9

Thank you, and my apologies if this is a dumb question -- I've done my best to find an answer through searching

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