Phone calls not coming through

[Karikki]

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?

[Uliwooly]

@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

[Didrik]

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.

[Karikki]

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.

[Didrik]

No worries, keep us updated!

[arulrajah]

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.

[Didrik]

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. 

[arulrajah]

Hello Didrik,

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

Thx.

[Didrik]

Alright, keep me in the loop!

[arulrajah]

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?