[Xperia Z Q&A, Help & Troubleshooting] airbus318:
Hey everyone,

I really need your help. I have a serious problem with my Sony Xperia Z 6603. I have spent too much time trying to troubleshoot this on my own so now I need your help and invite any if they have experienced the same. The synopsis:

At times, when utilizing my phone for phone calls, I got repetitive and persistent dropped calls.

Background info:

- City is Winnipeg of Canada

- Fido is my provider (essentially Rogers network)

- I have an LTE micro sim card (although Winnipeg hasn't had LTE rolled out just yet)

- I am rooted ONLY and on .434

- I have mobile network configured as follows:

- I use the LTE APN and select it on when in cities that have LTE

- Fido's website states this about bands:

Specs on the Z are as follows:

Now onto the symptoms....

The dropped calls occur sometimes when I am in a call, other times immediately when trying to dial out. An example would be, I'm driving and currently on a call, suddenly it cuts me off and my attempt to redial just keeps cutting me off from even placing the call. Wait a bit, keep driving, and now I can call again.

This problem happens in certain locations in the city. For instance at home I can be in calls for awhile, but there is this one part of the city for instance (just SW of the airport) and about a 2-3km radius that no matter what I do, placing a call is virtually impossible and yes signal strength appears normal. Also it appears that data is working normally. When I say impossible I will attempt the same call up to 10 times, each and every one dropping, some when 30 seconds into the call, others when immediately trying to dial out.

I also noticed that it also occurs while driving and talking for long periods. In other words, in a call normally and for a lengthy duration while transiting through the city and then suddenly drops perhaps while the phone is switching towers (a thought).

It's really bad. This is becoming impossible to tolerate and embarrassing to my customers and friends I speak with.

I downloaded an app from the play store called 'GSM Signal Monitoring' (https://play.google.com/store/apps/details?id=com.signalmonitoring.gsmsignalmonitoring&hl=en) to compile more information. Here are some screenshots but don't really know how to interpret the data. I see the db levels appear normal for a signal but not sure why the graphs reflect sudden spikes like that, perhaps my issue? Also notice in the graphs when the color changes for a new line, I believe when transitting from one tower to the next while driving. I was hoping some of you could perhaps try this app and compare what your results look like to mine, especially if you happen to be utilizing this phone in Winnipeg as well. Or if you know already, provide some insight on these results....

Things I have tried in my troubleshooting:

- Rebooting

- Switching DATA off completely (this seemed to provide a fix at times, but not at all times)

- Called FIDO and had them perform a "switch" or "network" reset of my phone on their end

Things to consider:

- The LTE micro sim is fairly new (upgraded it about 2-3 weeks ago)

- There are times when the phone works as it should and calls are placed and held normally (such as from within my home, SE corner of the city) but even near my home, while driving, I've had the calls drop but don't forget this doesn't just happen ONLY when I'm driving/transiting. There are spots where I am situated and can't place any calls without it dropping either shortly after or within 60 seconds of connecting.

I am really hoping that someone out there can help me resolve this issue or at least provide some direction from here. I purchased it from the UK so if it's a hardware issue I will probably have to send it back to the UK for the warranty to be honored.

Thank you for taking the time to read my dilemma!