Checking if International Day Pass has been triggered

Your info is spot on.

As long as your child has turned off her E-Sim, has turned off roaming data, and doesn't turn her e-Sim back on unless she is on a Wi-Fi connection, there shouldn't be a problem. 

But in the grand scheme of things, international day pass is a lot better than pay-per-use charges. And if she absolutely needs to because of an emergency she can use the service

Unfortunately roaming services may not report back usage on your account for days or weeks which is not going to be very comforting for you

This is the text message I received when I turned on my At&T line with WiFi calling after arriving in England. This has yet to trigger the IDP charge. I leave my AT&T line turned off until connected to WiFi. 

Hi, it's AT&T. Great news! You have our best international package, International Day Pass, on this line. This means you can use your phone like you do at home with unlimited talk/text and the data included in your AT&T plan for $12/day. Pay only for the days used abroad with a max of 10 daily fees per line per bill. Additional lines used the same day are only $6/day. For details, go to att.com/IDPTravelTips (ENG). Para detalles, visita att.com/viajar (ESP). Enjoy your trip and safe travels!

It kinda amazes me that you cannot see in your account when IDP has been triggered on each line.

>As long as your child has turned off her E-Sim, has turned off roaming data, and doesn't turn her e-Sim back on unless she is on a Wi-Fi connection, there shouldn't be a problem. 

She cannot turn off data roaming or her O2 travel eSim won't work.  Might be best to have her just turn off her ATT eSim.  I think she wanted it on to get SMS texts for application logins and such.  The O2 eSIM is selected as the default eSIM for both calls and data and automatic switching for data is DISABLED.  

>But in the grand scheme of things, international day pass is a lot better than pay-per-use charges. And if she absolutely needs to because of an emergency she can use the service

Agreed, and we've used it for many years successfully (I had to have my number accessible for work).  I remember traveling to Europe before IDP and it was a real hassle and very expensive, even for small amounts of data.  

>Unfortunately roaming services may not report back usage on your account for days or weeks which is not going to be very comforting for you

That's true.  Seems a lot better today though as my other kid was traveling on a shorter trip in Italy so I just had her use IDP and it seemed to update usage pretty much daily.

>This is the text message I received when I turned on my At&T line with WiFi calling after arriving in England. This has yet to trigger the IDP charge. I leave my AT&T line turned off until connected to WiFi. 

She got that message now twice (she has been in two countries).  I thought you also get a message each 24 hour period that IDP triggers, but I honestly don't recall and I just used it in Europe last fall myself!

Matt

So I decided to call support and ask these questions. It was a bit of a futile conversation.

First, he could not understand what I was asking.  I had to explain it a lot of different ways.  He kept just trying to explain to me how IDP works.  

Eventually he understood (I think!), but he could only see the same information that I can see (Talk/Text/Data Usage).  They have no way to see if IDP was triggered on an account, which I find amazing.   We were literally looking at the same data.  I pressed the issue a bit, but he confirmed that they have absolutely no way to see if/when IDP has been triggered in the current billing period.  I still find that amazing.

He did confirm that INBOUND SMS texts should not trigger IDP.

He did confirm that ATT WiFi Calling should not trigger IDP either.

I'm not sure though if that is in writing somewhere (I thought I saw something somewhere about texting).

So the only sure-fire way to avoid IDP is to actually disable the ATT eSIM (as was suggested).  Otherwise, you do risk accidentally triggering IDP.  However, if you use services that use SMS Text for two-factor authentication, you won't get those text messages if you disable the ATT eSIM.  Just something to be aware of if you need it to login to services.

I also said something incorrect above, data roaming can be disabled on a PER eSIM basis, I didn't realize that.  I confirmed that my daughter has data roaming disabled on her ATT eSIM but enabled on her O2 Travel eSIM.

In the end, the ATT rep basically said, watch the usage and if you think the IDP charges are incorrect, call and complain.  That's basically what he told me to do.

Hopefully this info helps someone.  I'll try and post the results at the end of the billing period.

Matt

@krowten 

There are separate controls for each line. Including data roaming. If you wanted to just turn off the AT&T SIM entirely, absolutely you can have her do that.   

> There are separate controls for each line. Including data roaming. If you wanted to just turn off the AT&T SIM entirely, absolutely you can have her do that.   

Yes, I now see that data roaming is per line, I was mistaken on that.

Last time she traveled abroad I had her do just that, disabled the ATT eSIM.  But then you cannot get any SMS Text messages to the ATT number, which can be problem for accessing services that send second-factor auth codes this way (which is many these days!).

Since I always need my line though for business, I've always paid for IDP and didn't even think about it (even though I think it's ridiculously priced now, that recent increase, the monthly line increase, and the lowering of priority of the top Ultimate plans so ATT and can charge another $7 for "turbo" is just rubbing me the wrong way).  I'm now thinking I should just get a local eSIM in the future like I did for her and make it primary, but leave my ATT eSIM active so that I can get a call if it is important (and incur IdP charge of course if I answer).  Best of both worlds!

I actually still have a physical sim in my iPhone 13 Pro.  Can you have both a physical and an eSim?  I believe that is possible but I wonder if I should just convert my ATT sim to an eSIM at this point.

Matt

iPhone 13s are dual SIM phones. You can have two SIMs, either one physical and one eSIM, or two eSIMs.  Not sure why you would want to give up the physical SIM and convert it to an eSIM.