<div dir="ltr"><div>This is true, but only in part. </div><div><br></div><div>When you make a non-WiFi cellular call, you are using the radio link between your phone and the cell site ("tower"), and then the mobile network operator's own network arrangements between the cell site and the mobile network operator's core network. </div><div><br></div><div>When you use Wi-Fi calling, you bypass the radio link between your phone and the cell site and the MNO's network arrangements between the cell site and the MNO's core network. Instead, your phone's radio link is to your Wi-Fi AP and the phone uses your Internet connection to make an IPsec tunnel to your mobile network operator's core network which it then uses to deliver your call to the MNO's core network. </div><div><br></div><div>If the problem is that the cell site serving your location is down or having a problem with its link to the MNO's core network, switching to Wi-Fi calling will probably work around the problem. On the other hand, if the problem is that the MNO's core network / authentication servers / etc are having problems, using Wi-Fi calling is less likely to get your call through.</div><div><br></div><div>Cheers,</div><div>Rusty</div><div><br></div><div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Sep 30, 2024 at 1:55 PM jrk1231-outml--- via Outages-discussion <<a href="mailto:outages-discussion@outages.org">outages-discussion@outages.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span style="font-family:Arial;font-size:14px;line-height:150%">FYI... for most cellular providers, if you are using WiFi calling, then you are using your WiFi/Internet provider's network to place calls, NOT your cellular network (as per T-Mobile Engineering). <div><br></div><div>I had an issue last week where WiFi calls failed, but celluar calls worked. T-Mobile said that was because my ISP was having a WiFi calling outage, but the rest of their network was working. (The next day, their business-class cable experienced a system-wide outage for about 19 hrs.)<br><br>Just a heads-up.<br><font size="1"><span style="font-family:"times new roman",serif">--<br><b>Jon R. Kibler<br></b></span></font><div><font size="1"><span style="font-family:"times new roman",serif"><b>Cell: +1-843-813-2924</b></span></font></div><b style="font-family:"times new roman",serif;font-size:x-small">Voicemail: +1-843-310-8879</b><div><font size="1"><span style="font-family:"times new roman",serif"><b>Secure IM:</b> </span></font><font face="times new roman, serif" size="1">ricochet:sntsak3fpvommuf4elxdvvcbkbpwlbmuzcnuag2fuvhrhks5fuyctiqd</font></div><div><br></div><br><br><div>On 9/30/2024 at 11:32 AM, "Nate Burke via Outages-discussion" <<a href="mailto:outages-discussion@outages.org" target="_blank">outages-discussion@outages.org</a>> wrote:<blockquote style="border-left:1px solid rgb(204,204,204);margin-left:10px;padding-left:10px"><div style="display:block">
<div style="display:block">
</div>
<div style="display:block">
<p>I'm guessing this is Cellular service. My cellphone is in
'emergency calling only' in Western Chicago Burbs. (Business
cellular plan FWIW) Even connected via WIFI Calling. </p>
<div>On 9/30/2024 10:28 AM, Jeff Shultz via
Outages-discussion wrote:<br>
</div>
<blockquote>
<div dir="ltr">
<div>I should have specified that this is a Verizon Wireless
issue. <br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Sep 30, 2024 at
8:27 AM Josh Luthman <<a>josh@imaginenetworksllc.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="border-left:1px solid rgb(204,204,204);padding-left:1ex;margin:0px 0px 0px 0.8ex">
<div dir="auto">I'm on Verizon Business in Troy/Casstown
Ohio. No problems.</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Sep 30, 2024,
11:20 AM Jeff Shultz via Outages <<a>outages@outages.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="border-left:1px solid rgb(204,204,204);padding-left:1ex;margin:0px 0px 0px 0.8ex">
<div dir="ltr">
<div>Lots of people down, some (like my wife)
aren't... Downdetector indicates it is nationwide. <br>
</div>
<div>Most phones appear to be SOS'd - the triangle!
symbol. <br>
</div>
<div><br>
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