Hello Tschwarzer,
Welcome to the community!
Firstly, you should note the forums are community-driven and not intended as a venue for customer services. We do not have access to customers' accounts nor would we know all the details of any changes Fido may have made.
Unfortunately, I don't believe the Basic plans allow for roaming:
I understand Fido has changed the All Basic Plans include information on the website. However, neither of their Basic plans specify roaming as an included feature (see Fido.ca).
If you wished to use your services while in Mexico, I believe you would need to switch to one of the Data, Talk, & Text or Talk & Text plans. Both of those plan-types would allow for roaming abroad.
**edit** If you do switch plans, you should note that Fido Roam is automatically enabled on Data, Talk & Text and Talk & Text plans. If you did not wish to use the feature, you would need to opt-out of Fido Roam. In doing so, your usage would be on a pay-per-use basis. You can view those rates here.
In addition, in order to prevent unintended roaming charges, it is generally recommended to disable data and roaming data. However, you should note that disabling those settings does not prevent roaming for voice and messaging. In addition, some manufacturers might allow some data usage to occur despite those settings (see here). That's why it is also generally recommended to enable Airplane and/or Flight modes in order to prevent unintended roaming usage. You could then manually enable Wifi when required. **
Hope this helps 😀
Cheers
