Hi, I'm with Bell Mobility in Canada and have this problem as well. Wifi always works but mobile data does the same for me too. I find sometimes toggling flight mode works to get it back. Toggling packet data doesn't help the problem. Even restarting phone hasn't helped the problem at times. I'm starting to suspect that PowerAmp may somehow disable the internet, but I have no proof of this. It seems to happen whenever I'm using this program but not all the time. My phone is not rooted.

 

did u turn on data roaming?

 

You said you've reverted to the stock firmware. Does the installed modem firmware match? Check Settings/About phone and compare Baseband version with Build number.

 

No, it shouldn't matter so long as the version (KG3) is the same.

It's perfectly possible to run differing firmware and baseband versions without problems btw, but matching them reduces the risk of incompatibility issues when troubleshooting.

 

Had the same problem with data connection dropping or disappearing altogether and only a reboot would restore it.

Never had the problem when i got the phone which was on the original Orange firmware.

Only started after i started using custom ROMS,tried various ROMS but kept getting the same problem, from what i can work out it was being caused by the custom firmware mixing and matching components i.e kernals and modem files etc.

Have just installed the XWKH4 firmware from XDA, its in the Frankenstien section


http:// forum.xda-developers.com/showthread.php?t=1075278


Which uses the KH3 modem file with KH4 kernal and the problem has gone, not lost data connection all day, even switching on WIFI and then off which used to cause it is fixed, leaving phone for 2 or 3 hours untouched, still got a data connection when i wake it.

I did a full wipe of the phone/cache before i flashed it this time and then another after the flash just to make sure it was fully wiped.

Not a single problem, give it a try, hopefully will fix your problem as well

 

Your baseband version will update with the new firmware, mine was KG5 (also been KE2,KG3 depending on what ROM i had flashed) the KH/KG simply refers to the version of firmware KE being an old version KH the newest, the next incarnation will probs be KI or KJ

KE is gingerbread 2.3.3
KG/KH is Gingerbread 2.3.4
KJ will probs be 2.3.5

Baseband after firmware upgrade is KH3 kernel is KH4 modem is KH3 (this is the important bit for the data connection, i think your confusing your baseband with this)

I'm in the UK as well and the phone is working better than it ever has

the KH4 firmware is a single file which you iinstall using Odin, very simple.

It is a non wipe version tho, which is why i completley wiped my phone before installing

 

hello guyz i am new user of android and its my first android phone gs2 i cant receive and send namecard or known as business card in some phone my packet data(data network) is enable some one else having same problem plzz help !!
and my baseband version is : i9100XXKF1
build number : GINGERBREAD.JPKG2

 

I have had trouble with it as well.

But i think i got the solution. (it has been working for most of people that i see on foruns, and it is improving the connection response speed as well).

You try to change the modem of this firmaware. Get a new modem, KG6 modem's has worked for people with this problem.

Try to get only the modem.bin file, and change it using ODIN!

If you dont know how to do it, or if you cant find kg6 moden.bin , just tell me and i will try affording it for you!

 

Did you download the XWKH4 firmware from XDA ? if so once you extract it you should have had only one .TAR file which you put into ODIN 1.85 in the PDA section

Then flash that, it contains everything you need

 

You should have just ONE tar file named

GT-I9100_XEU_I9100XWKH4_I9100XXKH3_I9100XEUKD1.tar

You should have downloaded a self extracting zip file that will give you the above file
That is the only file you need, as i said use ODIN 1.85 which you can download from the same page at XDA, select this file as PDA and nothing else

Then connect phone and flash