X10 not connecting to mobile data networks after upgrade to Android 2.3

My X10 does not connect to GPRS / EDGE / 3G / HSDPA after the upgrade to 2.3. Wifi is no problem, though.
I used the SIM card in another X10 with Android 2.1, no problem, got an HSDPA connection. And yes, all the boxes are checked: "Data Enabled" and "Data Roaming";
I had problems before the upgrade to connect to data networks when roaming, but never in my home network. Now, it doesn't seem to work at all.
Any advice?

go to settings -> sony ericsson -> data download
or
settings -> wireless & networks -> mobile networks -> access point names -> MENU -> add New -> enter the APN info -> MENU -> Save
"I'd rather be hated for who I am, than loved for who I am not." Kurt Cobain (1967-1994)

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Hello razmee209. Thank you for your response. I spent the better part of yesterday working with Apple Support. They tried their best, to include backing up photos to my HP laptop, backing up the iPad to iCloud, then resetting the iPad in total. Same problem. I restored from the cloud to recover my apps, same problem.
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Hi beingkejo,
Thanks for visiting Apple Support Communities.
Toggling Airplane mode and cellular data are good troubleshooting steps. If your iPhone still does not connect to cellular data automatically when Wi-Fi disconnects, I recommend the additional steps in this article:
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http://support.apple.com/kb/ts3780
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Some things to try first:
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~~~~~~~~~~~~~~~
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Stiletto85 wrote:
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<Edited by Host>

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Hi Ragge
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''Tried to reverse OS a few steps back...''
How did you do that?.
Can you install THIS ->Open the app->MTK Settings->Telephony/BandMode->SIM 1(Do the same for SIM2) and make a screenshot(Power&Volume-) ->post the screenshot here.Thanks
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I bought an unlocked 3G and when I try to use the internet, it says 'Could not activate mobile data network'.

Hi all,
I have recently acquired an iPhone 3G 16GB. It is unlocked and I have put my sim card in (Virgin Mobile) and used it without problem when calling or sending text messages. The internet all works fine when connected to a wi-fi network.
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Any help would be greatly appreciated, all questions may sound silly, but this is my first iPhone and I am very inexperienced with them!
Thanks

First, you don't have a 3G if you have iOS 6.1.4. The 3G cannot go higher than iOS 4.2.1. That is not related to your problem, but worth knowing.
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I am from india...my ipad2 is not able to activate cellular data network after i updated it to ios5

i am from india...my ipad2 is not able to activate cellular data network after i updated it to ios5

Hey Shaiju isac,
I'd take a look at the following article, it'll guide you though steps to you troubleshoot cellular data issues on your iPhone:
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http://support.apple.com/kb/ts3780
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So I just bought mine, at first I thought its not a problem, it just take times to get a network line.
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After updating my iPhone 5 to iOS 8.1 it will not connect to the wifi network at work even though it recognizes it. It however still automatically connects to the network at home. I have restared the phone and toggled the router, still no connection

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When your device is trying to connect to the work Wi-Fi network, go to Settings > Wi-Fi > then tap on the name of the Netowrk that she is having trouble with. Then tap on forget this network. Let the device attempt to connect again and make absolutely sure she is trying to connect to the work network and not a nearby network, then make absolutely sure the password is entered correctly.

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This might help
http://support.apple.com/kb/ht3406

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