Thanks Walter. I have already read it carefully.

My points:

- The end of 2020 doesn’t seem to have arrived yet. That’s why it’s interesting that my 2G no longer works

- UMTS band 2100 is probably already being switched off in the cities. Is there any information and perhaps maps?

I read up on the topic quite a bit yesterday. An important point will also be the possibility of VoLTE calling on all possible devices. This is also the reason that I couldn’t be reached in a city with my Pixel 3 and Wingo/Swisscom last weekend, as Google and Swisscom don’t see common ground here.

According to forum entries, it now seems to be working on the Pixel 4. @Anonymous: can you provide further information about this? It must not be the case that frequencies are switched off and customers can therefore no longer be reached.

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Hello @pat_rick

at https://scmplc.begasoft.ch/plcapp/pages/gis/netzdeck.jsf?netztyp=EDGE you will find a network coverage map. You can search for addresses and then select 2G or the version you want.

Note that the data is from the beginning of the year. So take a look to see whether the location is right for you and whether the data has been updated there in terms of pronouns.

Otherwise I would just call the hotline directly on 0800 800 800 and ask. Maybe there’s something wrong with your device.

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Kærar kveðjur - herzliche Grüsse
Dominik

Thanks for the feedback and card. Doesn’t seem to be updated yet.

I just spoke to an ex-Swisscom employee from the valley where I live. Apparently the 3G network is still running at full capacity here, including the 2100 band. What is already being switched off in cities. Which brings me to my second point:

If 3G is switched off completely here, I will no longer be able to make calls with my Pixel 3 as long as VoLTE is not made possible. Is there an official statement from Swisscom that guarantees this? See various forum posts, including: [/t5/Mobile/Advanced-Calling-VoLTE-VoWIFI-wifi-calling-Essential-Phone/m-p/550797](https://community.swisscom.ch/t5/Mobile/Advanced-Calling-VoLTE-VoWIFI-wifi -calling-Essential-Phone/m-p/550797)

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@pat_rick

So 3G isn’t just switched off without information, maybe the coverage is worse in certain areas!

The 2100 MHz frequency will be used for 5G instead of 3G in November 2019. However, the 3G technology itself will be available in the Swisscom network for a longer period of time: We offer the usual coverage with 3G until at least the end of 2024.

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Installationen, Netzwerk, Internet, Computertechnik, OS Windows, Apple und Linux.

I hope that 3G won’t be switched off completely without information. Interestingly, I was traveling in some areas and in many places I no longer had reception. Then again for a short time now and then, but rarely.

Then the obvious reason is that it’s my phone (Pixel 3, imported from Digitec). When I look at the specs of the various Pixel 3 versions, the majority of the common UMTS bands should be supported. So still very strange.

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3G/UMTS is best suited for voice telephony.

/t5/Mobile/VoLTE/m-p/538975#M4854

Swisscom has not yet announced a switch-off date for 3G/UMTS.

The broadcast of the 3G/UMTS mobile signal in the 2100 MHz frequency band (Band 1) was switched off throughout Switzerland.

The 3G/UMTS mobile signal will continue to be broadcast throughout Switzerland by all three Swiss mobile phone providers in the 900 MHz frequency band (Band 8).

For more information see:

https://de.wikipedia.org/wiki/Mobilfunkfrequencies_in_der_Switzerland

[https://mobilecommunity.ch/wbb/index.php?thread/347-swisscom-verzichtet-auf-umts-2100/](https://mobilecommunity.ch/wbb/index.php?thread/347-swisscom -waives-umts-2100/)

If the mobile phone can no longer register in the 3G/UMTS mobile network, this is probably due to a software error in the mobile phone. Remedy: Restart your mobile phone.

Regarding the 2G/GSM mobile signal: I recently noticed that Swisscom has activated “Frequency Hopping Spread Spectrum” in the 2G/GSM mobile network. For “Frequency Hopping Spread Spectrum” the formerly <empty> frequency band of 945 - 947 MHz in the downlink and 900 - 902 MHz in the uplink is used with “traffic channel => TCH”. The frequency band of 952 - 960 MHz is still used for the control channels (Broadcast Control Channel => BCCH).

https://de.wikipedia.org/wiki/Control_Channel

See also post no. 4 at:

[https://mobilecommunity.ch/wbb/index.php?thread/347-swisscom-verzichtet-auf-umts-2100/&postID=2764#post2764] (https://mobilecommunity.ch/wbb/index.php?thread/347-swisscom-verzichtet-auf-umts-2100/&postID=2764#post2764)

“Frequency Hopping Spread Spectrum” reduces the susceptibility of radio signal reception to interference and thus indirectly improves the signal and voice quality in the 2G/GSM mobile network.

https://de.wikipedia.org/wiki/Frequency_Hopping_Spread_Spectrum

https://en.wikipedia.org/wiki/Frequency-hopping_spread_spectrum

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Thanks for the detailed information and tips.

Of course, I have already restarted my Google Pixel 3 and completely reset it twice and reinstalled it. Before that, reset the network settings a few times. On the software side, everything is definitely cleaned up.

Could it be a hardware problem? I suspect less, since where I am now (Bündner Berge) it runs on UMTS Band 1. See screenshot.

UMTS Band 1 does not seem to have been switched off everywhere yet.

Screenshot: https://i.ibb.co/GTSbN7s/Screenshot-20200415-090549.png

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Especially in mountain valleys, no UMTS mobile signal on band 1 (2100 MHz) was broadcast by the Swisscom mobile phone antennas before October 1st, 2019. It is more likely that the network monitor app is providing incorrect information.

I strongly recommend inserting the SIM card into a Samsung mobile phone. On the Samsung mobile phone, call up the phone’s internal network monitor with the “phone number” “0011”. And to check the signal strength of the received mobile signal:

[/t5/Mobile/Natel-Empfang-bricht-%C3%BCber-die-Staffelegg-immer-ab/td-p/525279](https://community.swisscom.ch/t5/Mobile/Natel-Empfang- breaks-%C3%BCber-the-relay-leg-always-off/td-p/525279)

By inserting the SIM card into another cell phone, a possible hardware defect can be isolated (SIM card or cell phone?).

You should also check with the GSMArena website whether the mobile phone is suitable for global use.

https://www.gsmarena.com/

You can also select the appropriate model (Global, Europe, USA/(North) America) on the GSMArena website. For worldwide use, the cell phone must support the following frequency bands:

2G/GSM frequencies for reception worldwide
\=============================================

900 MHz (B8) E-GSM Europe, Australia, Africa, Asia basic coverage
1800 MHz (B3) DCS-1800 Europe, Australia, Africa, Asia basic coverage

850 MHz (B5) GSM-850 America basic coverage
1900 MHz (B2) PCS-1900 America Basic Supply

3G/UMTS frequencies for reception worldwide
\===============================================

Band | Frequency range | Procedure | remark
| (Downlink) | |
---–+———————+—————-+—– ————————————–
B8 900MHz FDD Europe, Africa, America
B1 2100 MHz FDD Europe, Africa, South Korea, Japan
B5 850MHz FDD America, Australia, New Zealand, Asia
B2 1900 MHz FDD America, Asia

Be careful with dual SIM card capable mobile phones (or SIM card + eSIM).

For the second SIM card, the mobile phone often only supports 2G/GSM!

Such mobile phones are not suitable for use in Switzerland!

Are the mobile reception problems with an eSim or with a nano SIM card in the Google Pixel 3?

You should definitely stay away from eSIM. See my comment at:

[/t5/telefonie-Wissensbox/eSIM-wird-die-SIM-karte-abl%C3%B6sen/tac-p/543237/highlight/true#M32](https://commu nity.swisscom.ch/t5/telefonie-Wissensbox/eSIM-wird-die-SIM- Karten-abl%C3%B6sen/tac-p/543237/highlight/true#M32)

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Thank you for your detailed feedback. My answers are welcome:

The Network Monitor app actually seems to provide incorrect information. I inserted the Wingo SIM card into a Samsung mobile phone and learned the following:

- 2G: 900MHz Screenshot

- 3G: Band 8 (900 MHz) Screenshot

- 4G: Volume 3 Screenshot

With my SIM card in the Samsung phone, 2G and 3G work, as does VoLTE and WiFi calling. Which apparently still isn’t supported on the Pixel 3.

When I insert my SIM card back into the Pixel 3, the Pixel 3 cannot find a 2G network. 3G works (probably also over band 8, 900 MHz). Is it possible that only parts of the 2G and 3G module are damaged? Or else we move on to the topic of frequency bands. Unfortunately I can’t find any country versions for Pixel 3 under gsmarena. The following page could be clarifying: [https://support.google.com/pixelphone/answer/7158570?hl=en](http://Pixel phone hardware tech specs)

But I haven’t really gotten any smarter yet. The problems somehow don’t make sense…

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@pat_rick wrote:

Is it possible that only parts of the 2G and 3G module are damaged?

Yes. As can be seen from the data sheet of the LNA chip Infineon BGA7H1N6, page 7, Figure 1:

https://www.infineon.com/dgdl/Infineon-AN432-AN-v01_00-EN.pdf?fileId=5546d46255dd933d0155e3e18de21765

A separate chip (2G IC) is often used for 2G/GSM mobile radio reception. Another chip (3G/4G IC) is then responsible for 3G/UMTS and 4G/LTE mobile reception. The 2G/GSM mobile signal is significantly narrower than the 3G/UMTS, 4G/LTE or 5G mobile signal.

The narrower the receiver, the lower the thermal noise and the more sensitive the receiver is to the mobile phone signal to be received. See also:

[https://de.wikipedia.org/wiki/Reichbreite\_(Radio Technology)](https://de.wikipedia.org/wiki/Reichweit_(Radio Technology))

It is therefore worth using your own receiving and transmitting unit (=> 2G IC) for the 2G/GSM mobile signal.

On the other hand, the antenna switch (ANT switch) could also be defective. If the cell phone has been set to “2G/GSM-only” mode in Settings->Cellular Settings and is not receiving a 2G/GSM cellular signal, the 2G chip is probably defective. The structure of a mobile device is always the same:

- Antenna

- Duplexer => Also called diplexer. Separates the mobile signal to be received (Rx) and the mobile signal to be sent (Tx) from/to the antenna into two signal paths. And filter out all radio signals that cannot be received or transmitted (=> harmonics) with a very strong filter.

https://de.wikipedia.org/wiki/Diplexer

https://energie.ch/harmonische-oberdrehungen-netzqualitaet/

- PA => Power amplifier. Amplifies the mobile signal to be sent. The mobile phone signal to be sent provided by the semiconductor electronics is very weak.

https://de.wikipedia.org/wiki/Endstufe

- LNA => Low noise amplifier. Amplifies the very weak cell phone signal received by the antenna. So that the semiconductor electronics (IC) can receive and process the mobile phone signal as optimally as possible.

https://de.wikipedia.org/wiki/Low_Noise_Amplifier

- SAW => SAW filters are bandpass filters. The SAW filters form the second filter stage of the received mobile phone signal. The first filter stage is in the duplexer.

https://de.wikipedia.org/wiki/Akustische-Oberfl%C3%A4chenwelle-Filter

The third and possibly fourth filter stage for the received mobile phone signal is located in the chip (IC). A lot of filtering is required to ensure the best possible mobile phone reception!

Before you conclude that there is a hardware defect, you should insert a different SIM card into your mobile phone.

According to the timing advance value in the screenshot from the Samsung network monitor, there is a distance of 1.10 to 1.65 km between the 2G/GSM mobile antenna from Swisscom and the mobile phone.

https://de.wikipedia.org/wiki/Timing_Advance

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11 days later