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guys i have issues with 3g mobile data it's not stable and i always lost connection for a bit i faced this proplem after update to .201 any help please 
How old is your SIM card? Do you have any taskillers or antivirus apps?
Hi MoSTaFa3oDaa,
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I first suggest that you re download the internet settings to the device.
Menu > Settings > More > Internet Settings > Accept Disclaimer > select network.
Now test the device, if this does not help then I suggest testing another SIM card in the device.
Let us know how you get.
mr uliwooly i think over 3 years ... and i don't use any task killer or antivirus
Jake-SonyXperiaSupport i already download the internet settings .. ok i will try another sim today and i will give u my experience
guys please i just want to know it's only me who have this proplem and it's not firmware issues ?
guys i changed sim card and same proplem please any advice this proplem happen after update to .201
You could re-install the latest update if you haven't done so
Bridge (for Mac)
Alternatives on How to backup Xperias
I do not think that before it was different,I think that during phone calls the data is disabled automatically.
I noticed that during calls the E/H/H+ near the signal is gone(only during calls).On Z1 and on P also.But as you say,it might be true also.