How to safely use OperaMini on Android phone via EDGE pay-per-data?

Question

Android

Phone: Chinese A7272+
Android version: 2.3.4
Processor: Mediatek MT 6513
DroidWall writes "iptables: no chain/target/match by that name", the firewall built into Avast and other programs using iptables also does not work.
There are no other firmware.
Is there really no way out so as not to be afraid to use the necessary applications via the mobile Internet, and anyone could use Wi-Fi. Since when you connect to the Internet, any application can start downloading something, updating it. And if you turn off the update, then you will have to update manually later, since not everywhere you can choose to update only via Wi-Fi, and in some you can’t turn off auto-update at all.
PS Do not offer the cheapest unlimited from the operator.

Answer 1

I solved it this way: through the Tasker app.
Everything is set up the way you want.
1) Once every 15 minutes, looking for a familiar wi-fi. If he finds it, he turns it on and everyone uses it. If not, then cuts down, waits 15 minutes. Saves battery and no need to manually cut down.
2) When I launch the necessary applications (opera, google maps, dropbox), the switch works:
OnAppLoad do:
- Search WiFi. If no WiFi:
Turn on 3G.
OnAppClose
- Turn off 3G.
All. Just what you need. And you don't need to recompile the kernel :D

Answer 2

Android CONSTANTLY uses the Internet. Every 5 minutes, some fucking app will be asked to go away. And you won't stop it. Did you just buy a phone yesterday? You will know :)
You can only cut this mess with a knife switch. That is, turn off the mobile Internet when there is no need for it. All.

Answer 3

I don't think it's possible to implement this without iptables, and, moreover, it's not about the firmware (on android it is understood that the kernel is not included here), but in the kernel.