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how to prevent data roaming?

how to prevent data roaming?
Is there a way to detect when im outside local area when using data, so it will stop automatically or show some kind of notice.
If accidentally using data while roaming for a while, it would be costly.

Systems settings > Wireless > Mobile Network Settings > Data Roaming

Try APNdroid, you will find it on the Android market.
For more info, read here: http://martin.adamek.sk/?p=45

UK Networks 2G Data Call = Missed Call - Help Needed

Hi All,
I would like your assistance with something. All it's going to take is a call to you network provider after a quick test with your phone.
The Problem:
Do you miss calls even if the phone has full signal and may even be in your hand? If the answer is yes and you are on any network other than Vodafone, then you are experiencing my frustration. It's due to the networks not prioritising voice calls over data calls when there is an active 2G/GPRS connection. This is not related to the handset at all it's network-side.
The Test:
1. Turn your phone to GSM mode. For my phone it's Settings > Wireless & Network > Mobile Network > Network Mode
2. Start a data connection
3. Use an app that is data intensive e.g. Google Maps
4. Use another phone to call your phone
If I am right, due to a lack of Dual Transfer Mode capability, your phone will bounce the call.
The Solution:
The only solution is for you to call your network and complain. YOU PAY FOR THE SERVICE SO THEY SHOULD PROVIDE IT.
My network is Orange and they say they are looking into it but I have no confidence in them as they say they have never experienced this. It's been the same since I had a Nokia N95 but smart phones these days are so much more data intensive so the problem is greater.
Thanks for you time.

On all the phones I've had with Voda and O2, if I'm using data and get a call, my net connection drops and I get the call.

Background Data vs. Always-On Mobile Data

I could never get a clear-cut answer from the differences of both of these. I could also never get the advantages/ disadvantages of having them on or off.
The closest thing I could find was this:
Tom Cruise said:
Okay, I did some testing and thought others may find the results useful. I should clarify that none of this applies if you have notifications disabled in any of the individual application settings or have misconfigured something else. I have "Auto-sync" enabled (Settings > Accounts & sync > Auto-sync). All testing was done with Wifi off and the phone set to idle/sleep.
Note: The settings discussed above can be found here:
- Settings > Wireless & Networks > Mobile Networks > Enable always-on mobile data
- Settings > Accounts & sync > Background data
- Settings > Wireless & Networks > Mobile Network
Test 1: Always-on mobile data ON / Background data ON
- Push Gmail works properly
- Push Exchange mail works properly
Test 2: Always-on mobile data OFF/ Background data ON
- Push Gmail works properly
- Push Exchange mail works properly
Test 3: Always-on mobile data ON / Background data OFF
- Push Gmail does not work
- Push Exchange mail works properly
Test 4: Always-on mobile data OFF / Background data OFF
- Push Gmail does not work
- Push Exchange mail works properly
Test 5: Always-on mobile data OFF / Background data OFF / Mobile network off
- Push Gmail does not work
- Push Exchange does not work
Additional comments:
- Regardless of the above settings, incoming phone calls and SMS messages were received properly.
- I have my phone set to have Google Voice handle all voicemail, and this too worked properly regardless of the above settings.
- Disabling Always-on mobile data in itself seems to make a big difference in battery life. I have this off and Background data on. So far, everything I use seems to work properly with these settings, and battery life is plenty for me to get through a day with frequent use.
Click to expand...
Click to collapse
Ever since I've owned an Android device, I've always kept both of them check marked. But, out of curiosity, I unchecked "Always-on mobile data" on my S4G right now to see what kind of extra battery life I will get.
The only things I constantly want synced are my Exchange account, Gmail, and weather, so I'm hoping unchecking "Always-On Mobile Data" won't screw that up.
I just wanted to see what your opinion/ knowledge says on this whole Background Data vs. Always-On Mobile Data discussion.

Background data has to be ON to receive push gmails, whatsapps,etc internet background services...
Mobile Data always-on may not be checked...

zoro_op said:
Background data has to be ON to receive push gmails, whatsapps,etc internet background services...
Mobile Data always-on may not be checked...
Click to expand...
Click to collapse
Is there any benefit to having mobile data always on?
Sent from my HTC Sensation 4G using XDA App

I'll just add that if you turn off "Background Data" Market will not work.

[Q] Wasting Credit

I bought my boyfriend the samsung galaxy fit for his birthday last month. As much as he loves the phone it seems to be wasting all his credit. He is on pay as you go (Orange). He hasnt been on the internet for a while as it was using all his credit and at the moment all he is using it for is texting people. However his £10 top-up only seems to last a couple of days. He doesnt even text that much.
I was wondering if anyone had any suggestions as to why this is happening and if there is anything we can do? We have checked his settings and that the internet is off etc but we cant find the problem.
Will be very grateful if anybody could give me any suggestions as to what the problem maybe thankyou.

iam now expert but under setting > wireless and networks > mobile networks
turn of packet data , data roamin and on only use 2g
setting > wireless and networks > accounts and sync allso turn off background data and auto sync
setting > wireless and networks > appllication settings > samsung apps wifi only
ofcourse might be diffrent on your phone and i cant remember where you switch off auto update on market apps
allso try use wifi rather than 3g for internet etc
good luck and let us know
hep

Network manager, possible?

https://photos.app.goo.gl/UyHNNcAGjBRnNrJMA
I tried to extract an apk from my previous phone to install the program above, that didn´t work. It´s part of a smart suite and I managed to get messenger working at pushing notifications and calls always, I did that by preventing it from using wifi, it was on cellular data at all times.
Anyone know of a similar program, easy to use and just prohibits certain apps from using wifi?

How about Settings > Wi-Fi & Internet > Data usage > Wi-Fi > choosing an app there > Wi-Fi disabled?

hajducsekb said:
How about Settings > Wi-Fi & Internet > Data usage > Wi-Fi > choosing an app there > Wi-Fi disabled?
Click to expand...
Click to collapse
Thank you, had no idea that existed. Much appreciated.