topic Re: Phone calls not coming through in Z Series

Phone calls not coming through

Karikki — Mon, 15 Aug 2016 14:12:54 GMT

Hi,

I have this quite rare problem. Sometimes, when somebody tries to call me, the call will go directly to my voice mail without even leaving any indication of the missed call to my phone. I discussed this problem with my carrier (Elisa) and they think that the problem may be that when I am in 4G network, the phone can't switch to H+/3G/2G fast enough to handle the icoming call and that's why it will go straight to voicemail.

After that to phone goes in a sort of limbo and all incoming calls are going straight to VM. Restarting the phone remedies this, so I think the problem lies within the phone, not the carrier.

This is quite a rare problem but since I use my phone a lot in my work, it occurs at least bi-monthly. Somebody sends my an email saying they couldn't reach me, even though I've been looking at my phone all the time. Really annoying.

I have a theory that if I am using 4G (surfing the web, using spotify) it triggers this bug but I've not been able to replicate it yet.

Anybody else with this problem? Is this something that could be fixed in an update?

Re: Phone calls not coming through

Uliwooly — Mon, 15 Aug 2016 18:06:07 GMT

@Karikki

Things to try, boot in >>> safe mode for few hours you can also get a new SIM card and/or download the APN settings

Re: Phone calls not coming through

Didrik — Tue, 16 Aug 2016 10:25:19 GMT

Hi @Karikki,

Welcome to the forum!

Was there any change while your device was in safe mode? If not I would recommend that you first try with either making a call using another SIM-card or that you (temporarily) change the preferred network mode. To change network mode, go to Settings > More > Mobile networks > Preferred network mode > Select GSM (2G) only and restart your phone, you can also try this with WCDMA (3G) only followed by a restart.

Re: Phone calls not coming through

Karikki — Tue, 16 Aug 2016 13:50:33 GMT

Thanks for the tips! I have not yet had an opportunity to use safe mode for a few hours, but I'll try it later. Since the problem is so random and rare, it could take a while until I know if that worked or not.

Re: Phone calls not coming through

Didrik — Tue, 16 Aug 2016 14:21:56 GMT

No worries, keep us updated!

Re: Phone calls not coming through

arulrajah — Thu, 18 Aug 2016 08:08:32 GMT

I too have the same problem of missed calls showing & the phone NEVER rings. I get this far too often - like nearly once a day. Sony asking to change to GSM etc is not the right solution. They should fix the fault.

By downgrading from LTE, I am losing speed in my internet access to all my application.

Re: Phone calls not coming through

Didrik — Thu, 18 Aug 2016 08:13:00 GMT

Hi @arulrajah,

Have you tried what is previously mentioned in this thread? Was there any improvement?

The reason I suggested changing the preferred network mode was simply to try and find what may be causing this. If there was an improvement by changing to GSM or WCDMA you should probably contact your service provider.

Re: Phone calls not coming through

arulrajah — Thu, 18 Aug 2016 08:22:45 GMT

Hello Didrik,

I have just switched to "WCDMA only" option. Will test it for a few days & update you accordingly.

Thx.

Re: Phone calls not coming through

Didrik — Thu, 18 Aug 2016 08:39:49 GMT

Alright, keep me in the loop!

Re: Phone calls not coming through

arulrajah — Fri, 19 Aug 2016 08:42:49 GMT

Hello Didrik,

today, I had a missed call again. My phone did not ring at all. My phone "Preferred Network Type" setting is still on "WCDMA".

what next?

Re: Phone calls not coming through

Didrik — Fri, 19 Aug 2016 10:55:22 GMT

Hello again @arulrajah,

I see. Have you been able to try rebooting your device to safe mode? If the same thing still happens while in safe mode I would suggest a software repair using Xperia Companion as the next step.

Re: Phone calls not coming through

astap15 — Mon, 26 Sep 2016 11:22:41 GMT

I've experienced the same problems for a few months. I can add that when making a call it takes a long time for the phone to connect to the network and text messages typically arrive 10 min after being sent.

My phone has been set to prefer using the 4G network over 3G and GSM. I have always assumed that the phone when using that setting would automatically and continually chose the network with the best signal. This is not the case.

Today (after yet another missed call that went straight to VM) I checked the signal strength while the phone was connected to the 4G network. It was appalling ranging btw -100 and -114 dBm. When making a call the phone switched to HSDPA/3.5G and the signal strength went up to -75 dBm. After the call the signal strength dropped dramatically as the phone returned to the 4G network.

I have now switched the network setting to HSDPA/3.5G, rebooted the phone and will see what happens. Hopefully my calls will come through. But it is not a solution. I need 4G for certain services and the phone's ability to pick the best network is crucial.

Re: Phone calls not coming through

arulrajah — Tue, 27 Sep 2016 01:39:16 GMT

Tried both the Safe Mode & the repair option. But, still the same.

Re: Phone calls not coming through

Didrik — Tue, 27 Sep 2016 07:13:45 GMT

@arulrajah, are you still experiencing this if you use another SIM-card? If so I'd suggest that you contact your network operator about this.

Re: Phone calls not coming through

arulrajah — Wed, 05 Oct 2016 02:03:59 GMT

Even with another SIM card from another provider gives the same problem.

Re: Phone calls not coming through

Didrik — Thu, 06 Oct 2016 14:16:07 GMT

@arulrajah, if you still experience this after what you've already tried and if it still happens when using a SIM-card from another service provider I would advise you to have your device sent to and examined by an authorized service centre. Contact your Local support for information about how to have your device sent in.

Re: Phone calls not coming through

Admin529 — Sat, 12 May 2018 02:08:05 GMT

Same problem here however this is the first time what i can trace back is my os has been plagued with ads and malware have not cleane3d it up as yet possibility 1

next I enabled carrier vms 3 days ago and my first issue was today possibility 2

how do u turn off metro pcs voice mail with this phne

Re: Phone calls not coming through

Admin529 — Sat, 12 May 2018 02:13:00 GMT

Kanikki,

further testing shows when this problem is occuring go to

Settings>Network & Wifi>Dual Sims>Dual Sim Reachability> and set that to on let sim 1 forward to sim 2 incase of error and vice versa that allowd calls to now come thru

Re: Phone calls not coming through

Admin529 — Sat, 12 May 2018 02:17:15 GMT

I know the above does not remedy the problem but just bandaids it I like the answer someone gave about db strengty with the microwave, I am to try and relax the setting as much as possible to where we let sony make the choice between 3g forced and choiced.