@[deleted] wrote:
Unless you have a dual SIM device like me. Unfortunately, this is not supported by swisscom.
The previous dual SIM devices were all versions from other countries. VoLTE and WiFi calling are usually (or even always?) only available on devices from your own country.
At Swisscom it is even the case that unbranded Swiss devices also work with VoLTE and WiFi calling. Swisscom and Samsung seem to have agreed on this. In Germany, for example It only works with branded devices.
With my Swiss Galaxy S7 without Swisscom branding, I can easily use VoLTE and Wifi calling.
The Galaxy S9 is the first Samsung Galaxy dual SIM device that is a Swiss version. What I would like to have confirmed or refuted based on my own experience is whether VoLTE and WiFi calling work on the Swiss S9 devices with dual SIM.
@[deleted] wrote:
Possible, I definitely got it from Digitec and so all the functions described work on the Swisscom network.
Is it really a German device? Digitec currently has the Galaxy S9 DUOS 256 GB as model SM-G960FZKHAUT. That would be an unbranded Swiss device and not a German one.
Has Samsung really opened up the firmware to such an extent that a German S9 with Swisscom allows VoLTE and Wifi calling?
@[deleted] wrote:
@[deleted] wrote:
Possible, I definitely got it from Digitec and so all the functions described work on the Swisscom network.
Is it really a German device? Digitec currently has the Galaxy S9 DUOS 256 GB as model SM-G960FZKHAUT. That would be an unbranded Swiss device and not a German one.
Has Samsung really opened up the firmware to such an extent that a German S9 with Swisscom allows VoLTE and Wifi calling?
I can’t imagine that this is a German device. Especially because of VoLTE and WiFi calling. The easiest thing would be to quickly install the “Phone Info Samsung” app, then you can see what kind of device it is, including the date of manufacture, etc…
@[deleted] wrote:
I’m also wondering how exactly wifi calling works abroad.
According to message number 1022, Wifi calling does not work abroad. Wifi calling (hereinafter referred to as VoWLAN) works via a VPN tunnel from the mobile phone through the Internet to Swisscom. It is therefore very likely that Swisscom uses filtering of foreign IP addresses for VoWLAN. This filtering of foreign IP addresses can most likely be “overridden” with a dedicated VPN tunnel from the mobile phone to your own hardware firewall in your Swiss apartment.
Here are the technical details I recorded about Swisscom VoWLAN:
Swisscom VoWLAN
================================================= ==============================
VoWLAN: VoIP telephone conversation via WLAN (Voice over WLAN)
VPN tunnel (IKEv2/IPSec) on:
epdg.epc.mnc001.mcc228.pub.3gppnetwork.org
138,188,106,228
138,188,106,229
Port UDP 500 and UDP 4500
!!! Attention: Insecure encryption of the VPN tunnel!!!
DH group: 2 (1024 bit MODP)
PRF: PRF_HMAC_SHA1
INTEG: AUTH_HMAC_SHA1_96
NAT keep alive every 20 seconds
!!! Attention: NAT keep alive interval must be set due to firewall/NAT router
Be < 20 seconds! A NAT keep alive interval of
20 seconds may cause problems with incoming traffic
Make phone calls!
Dead Peer Detection (DPD) every 90 seconds
Data transfer rate during a telephone conversation: around 125 kbit/s
Authentication takes place via EAP-SIM or EAP-AKA. See also:
https://www.heise.de/security/artikel/MOBIKE-macht-mobil-270948.html
https://de.wikipedia.org/wiki/Extensible_Authentication_Protocol
https://de.wikipedia.org/wiki/Authentication
@[deleted] wrote:
In fact, WiFi calling and VoLTE are not real standards (unlike MMS, for example),
VoWLAN is specified by the 3GPP in TS 33.234:
https://www.etsi.org/deliver/etsi_ts/133200_133299/133234/13.00.00_60/ts_133234v130000p.pd f
Apparently it’s a Swiss device without branding. Production code is SM-G965FZKHAUT.
I could imagine that the firmware version that looks German is a security patch because I have already received 3 new patches since I got the device… Maybe Project Treble will bear fruit and Samsung will finally be able to distribute patches more quickly without all the provider components having to adapt. With my last devices I received an average of 3 patches over their entire lifetime
. It’s just a guess but I’d be happy
…
I bought my Nokia 8 Dualsim from Brack.ch. It’s also a Swiss device. I can switch on WiFi calling in the settings, but I cannot make a call with only WiFi reception. I would be interested to know why Swisscom discriminates against dual sim devices. Is it technical or what is the problem? I’m looking forward to an answer from @MarcoSa or another Swisscom employee.
18 days later
It is now May 2018. I bought an HTC U11+ yesterday and according to Swisscom Support, Wifi Calling does not work on this device although according to HTC the device is ready for Wifi Calling and VOLTE. Can I expect something or should I return the device to the seller Digitec and cancel the contract extension with Swisscom
I have that. As a non-Wifi Calling Guru, it was enough for me that the phone description said: Wifi Calling: Yes, VOLTE: Yes.
Furthermore, your contribution is completely unnecessary, as it does not contribute in any way to solving the problem and would therefore probably not have been written at all.
Now stop with your unbearable fanboy behavior @SaschaS! The only one who is messing up here (namely when it comes to implementing VoLTE and WiFi calling) is your esteemed Swisscom! And it can defend itself very well and has hired a bunch of marketing specialists and press spokesmen to do this, so it really doesn’t need your non-relevant posts.
@AnonymousWhat is the current status regarding universal solutions via the GSMA and new SIM cards so that this tragedy regarding free devices and firmware adjustments finally comes to an end?
I’m just saying what’s fact. Before I buy something, I orient myself and inform myself sufficiently. I won’t buy a Jaguar or Porsche until I know whether it even fits in my garage. Or is it? The best thing I can do is complain to the manufacturer why they don’t say from the outset that it doesn’t fit. 😂 And one more thing: Swisscom will have its reasons why such a device is not supported to this day. There are enough qualified employees working at SC for this.
Dear Sasha
They seem to want to say something meaningless about everything. Obviously you have infinite time.
After my quick check to see whether the HTC U11+ supports WiFi calling, I decided to buy this device for 99 based on the information from the manufacturer. I didn’t know that this technology is also carrier dependent. The only question I have now is whether anyone knows whether this is possible with this device now or in the foreseeable future. I don’t have time for endless clarifications. If that is not possible, I will return the device and get another one. It would be a shame because HTC is excellent apart from that. If it works, okay, if not, also good. Obviously, it’s not that easy to find meaningful information for me, because so far I haven’t heard anything other than your extremely helpful comment.
I wish you a relaxing Pentecost weekend with many more useful posts from you.