Hello again,
Thank you for the additional information. Firstly, I was able to confirm that merely receiving that Welcom message does not incur roaming fees (see here).
That said, I understand your charges were apparently for a sent text message. I cannot speak as to what usage occurred on your account. I understand it is frustrating being charged for something you cannot verify. However, the only way usage can be recorded on the system is through your SIM card. It isn't possible to use services without the SIM card.
I understand you were wanting to know the number to which the text message was sent. Unfortunately, I don't think that information is kept on the system. Text messages are only transiently on the system. Once a message is delivered, it is removed from the system. If a recipient device is not able to receive the message, it will stay on the system for only a few days. After a couple of delivery attempts, if the recipient device is still unreachable, the undelivered messages will also be removed from the system. The only record would be that a text message pass through the system.
Hope this helps 😀
Cheers
Hey @vlasmarias
Welcome to the Community.
To clarify a few things, though @BobC83 is correct in saying that we can track communications, we actually do so using your Fido SIM card and not your phone's IMEI. For example, if you used your Fido SIM in another device while travelling, we'd still have the history of SMS, calls and data, even if your usage history is not available on your personal device.
What you need to know about your Fido service is that when you cross a border, an SMS and email notification will be sent to you. This notification will inform you of the available rates at your destination, include a link to our roaming coverage, and a contact number to reach our customer support. These details are linked in @Cawtau's solution 
On our end, we will only charge you if there is usage made while roaming using your Fido SIM card. That is the only way we can track a communication to your device. Billed usage are calls (incoming and outgoing), sent texts (incoming are free), and mobile data.
In regard to your SMS request, I'm sorry to hear that we did not share the outgoing number texted. We can confirm that text message content cannot be provided, but we can disclose the number texted as long as it's a cellular number. Those records are kept for 90 days and no court order is required. Please contact us at these channels and we'll be happy to look into it.
Hope this helps!
Hello again,
Since those are business SIM cards to which you refer, they might have additional services, such as retaining message contents. However, that is not necessarily the case with personal services. I assumed you referred to your individual account as I do not believe Fido offers business plans.
I don't think the mobile providers are required to keep the contents of text messages. For example, the graphic shown here shows the majority of US mobile providers do not retain the contents of text messages. That notion is supported by:
~taken from here.
I understand both of those references are a little dated. This article on Cellphone privacy laws also notes:
I also understand those references are related to the United States. While it's true different Countries may have different regulations, it seems as though many Canadian cellular providers also do not keep the contents of text messages:
~taken from here.
I further understand that ruling is also dated. However, I am not aware of any more recent ruling compelling mobile providers to actually keep the contents of text messages. I suspect privacy could be an issue.
While business services might keep the contents of text messages for an extended period of time, it does not appear the same holds true for personal services.
Hope this helps 😀
Cheers
