Xperia Z C6602 : Network signal issue(Full signal but wont receive or able to dial calls)

[Srinath_Reddy]

I have this unique problem with my xperia z which I bought a month ago in India.

My following issue happens at times and it doesn't follow any cycle.

My Airtel network signal shows full strength but when some one calls me they get network tone "Number not reachable or out of coverage area". When I try calling during this blackout, no calls or messags would go through my mobile. I can use all the apps during this time. A hard restart would solve my problem when i face this. However the issue is I won't know when my phone is going in to this state, Unless some one say to me personally or call on my other mobile to inform that my number is not reachable.

This happened atleast 5 to 6 times in the last one month.

Someone please help. I cannot take this to service center as its not a permanent issue.

PS: I have disabled STAMINA mode on day 2 itself as I observed that network signals are lost when my phone is going to STAMINA mode.

[user761]

I think, I found something here....  When I reach office, I will go to cellar parking which is in -2nd floor, where there is no signal and I see the grayed cellular signal with red cross mark on mobile.  After coming to ground floor, I will for sure get the full signal strength, but, my mobile goes to unreachable mode.  The only way to bring connectivity is to restart the phone.  I guess, this could be of some help for Sony people to look into this issue.

I tried few times today and confirmed that the above steps work perfectly to reproduce the problems we all are facing here.

[user761]

Hi All,

I found the solution to the problem finally.  I did it on my phone and having no problems from around one week.  Getting all incoming calls without any problem and could do calls as well.

Here are the steps:

* Goto Settings

* Go to More...

* Goto Mobile networks

* Goto Network operators

Let the phone search for all available operators.  This will take a bit of time.

For Airtel customers: 

There will be two entries with Airtel - Airtel 2G and Airtel 3G

Touch both of them.  You will get a message that the mobile is registered.  Make sure to register with both 2G and 3G networks.

Go back and enjoy the phone.

The same thing can be applied for Vodafone also, but I have not checked it.

[Sonali_Jadhav]

i have same problem, i have xperia z c6603, and airtel network, sometimes network is just gone, amnd sometimes my phone shows full network but when somebody try to call me they get message saying my phone is out of covergae. So weird. Sometimes i am on call for 30 mins and when i hang up it shows no network.

[Vicks2390]

There is an problem in signal.
Only two bars are available which are not sufficient
For making a call.

[bhargavreddem]

Hai
I faced a similar problem in my xperia z (c6602) mobile. I was unable to get calls to my mobile when my mobile data traffic is enabled and as soon as i disabled it i can receive the call. I think it is due to the kitkat update (4.4.2) As problem came after the update. Will it be degraded?

[pranav_mathur28]

Hi, how did you manage to register with both 2G and 3G networks at the same time? I'm having this issue while trying to use Vodafone 3G in bangalore. When I register with 3G network with WCDMA preferred mode, the network signal keeps dropping off intermittently. Could this happen because of an old SIM card?

[RM84]

Same situation

[Singh2]

I am also facing same signal issue after upgration from kitkat to lollipop.I gone to service center,they told motherboard faulty.Mobile is out of warranty. I am so upset now.Is this my problem or sony company problem that i upgrade my device.

Please advise what will be the solution.

[xavinux]

Hi @Singh2

First I suggest doing a backup of your device information: How to backup?

Then try to repair your device using PC Companion.

I hope can be useful.

Best Regards,

[Elkhansaà]

Hello sam
I have thevsame problem in my experia z1, that ther is no mobile network signal so please i need help