topic Re: Xperia Z 4G LTE for T-Mobile connection problems in XPERIA archive

Xperia Z 4G LTE for T-Mobile connection problems

Tragico1 — Thu, 19 Sep 2013 22:21:53 GMT

I purchased the Xperia Z 4G LTE for T-Mobile (C6606) from the Sony store about a month ago. For the first 2 weeks it worked great - I was getting 4G LTE coverage almost everywhere I went in town (and 2G/3G otherwise). Then something happened about 2 weeks ago, and now I cannot get any quality cellular phone or data connection.

That day I was using Wi-Fi at my office, because the cell signal is very weak inside the building. When I left work I had trouble finding the T-mobile network. Since then, I have 0 bars or the Red "X". When I search for networks, I either do not see any networks or re-register on T-mobile only to have a weak signal for a short time before it was lost again.

I had used Wi-Fi at work, home and other locations and had no problems reconnecting to the cellular network prior to that day. I mention this about Wi-Fi because I have seen other posts about there being a potential bug related to the Location-based Wi-Fi feature. I have tried diabling that feature without any improvement.

I have also attempted these fixes with no success:

* Power cycle, remove & reinsert sim.

* Have T-mobile reset my connection

* Used the "Update Service" to make sure my device was up-to-date.

* Full factory reset.

Please help!

Re: Xperia Z 4G LTE for T-Mobile connection problems

Uliwooly — Thu, 19 Sep 2013 22:50:24 GMT

How about this

settings > xperia > internet settings

Re: Xperia Z 4G LTE for T-Mobile connection problems

Uliwooly — Thu, 19 Sep 2013 22:50:57 GMT

Also contact Tmobile for any coverage issues in your area

Re: Xperia Z 4G LTE for T-Mobile connection problems

Tragico1 — Fri, 20 Sep 2013 17:07:10 GMT

Thanks uliwooly.

Coverage is not an issue. I've used T-moble in my city (Minneapolis) for 15 years with no coverage issues. I have a friend with and iPhone on T-mobile sitting right next to me. He has 2 bars (we're in a low spot) and I have no serverice (Red X).

I stopped into my local T-mobile store today to have them check the sim. And with disgusting irony, when I show the rep my phone, it has 4 bars, and 4G LTE. Clear as day. The store must be next to a tower. I look like a fool to the T-mobile guy, but at least I learned the sim is fine.

I drive away from that strong spot and it doesn't take long before my coverage drops. I'm watching as I drive, and it's never better than 2 bars and usually No service. My previous phones never had this problem moving around the city.

The Xperia Z cannot perform with anything but the strongest cell signal (next to a tower) and it does not handoff from tower to tower as I move around. This is not a sim/coverage issue. It is a Hardware or Firmware issue that Sony needs to address.

Re: Xperia Z 4G LTE for T-Mobile connection problems

Uliwooly — Fri, 20 Sep 2013 19:59:22 GMT

check this

settings > more > mobile networks > Network mode, what do you have selected?

also

Accesss point names > under Bearer what option do you have? leave it as Unspecified

one more thing

settings > about phone > status > signal strength

Re: Xperia Z 4G LTE for T-Mobile connection problems

Tragico1 — Fri, 20 Sep 2013 22:15:45 GMT

network mode = LTE(preferred)/WCDAM/GSM

APN = fast.t-mobile.com (it's the only option. I can unselect it by doing "Reset to default", but that doen't seem to do anything)

Signal strength = -113 dBn 0 asu

Re: Xperia Z 4G LTE for T-Mobile connection problems

Uliwooly — Fri, 20 Sep 2013 23:33:35 GMT

tap on the APN and check the bottom

Re: Xperia Z 4G LTE for T-Mobile connection problems

aye007 — Sat, 18 Apr 2015 13:41:04 GMT

My xperia z 4G is no working in network.This may be 4G root error.Network maximum bar is 2bars.Sometimes it will be Red "X" near mobile tower.How do explain it? Please answer.