Hello CaraZhao,
Welcome to the community!
Firstly, you should note that these forums are community-driven and not intended as a venue for customer services. We may not be aware of all Fido policies.
As far as I can tell, these appear to be the device's bands/frequencies:
LTE TDD:B34 /B38 /B39 /B40 /B41
LTE FDD:B1 /B2 /B3 /B4 /B5 /B7 /B8 /B12 /B17 /B18 /B19 /B20 /B26 /B28
~taken from here.
According to those specifications, that device should have some compatible LTE bands/frequencies (see here). So, that device should be able to access the LTE networks. I also undertand your device may be voLTE-capable. However, that capability might not be compatible or supported on all networks (see FAQs here). It's possible the device is could still be reliant on the '3G' network for calls and text messaging.
You should note that Fido traditionally have not supported certain services (ie voLTE and/or Wifi-calling etc) on devices or versions of devices they do not sell. Though, that does not necessarily mean people had to purchase from Fido. Fido sells the same Canadian versions of devices as the other Canadian mobile providers as well as local box stores etc. As long as the device was the same version as the one they sold, it was possible for those services to be supported.
On the other hand, non-Canadian versions of devices (ie US or Global Samsung S series etc) would likely not be supported for those services. In addition, other devices from manufacturers which are not generally sold from Fido or Canadian mobile providers (ie Xiaomi, OnePlus, Oppo, etc) are also likely not to be supported for those services (see here, here, here, here. etc).
Without voLTE, calls and/or messages would necessarily fall-back to the '3G' network. Unfortunately, Fido/Rogers intends on decommissioning the UMTS/WCDMA network July 2025. After the '3G' sunset, you would likely not be able to use that device for calls or text messaging.
I understand that once the '3G' network is decommissioned, limiting voLTE to only Canadian versions of devices they sell will be problematic for other device users. That said, there may be hopeful news for customers with devices manufactured after 2019 (see here). Apparently, Rogers is in the process ensuring voLTE will work on those devices. However, I'm not sure of the progress of that work.
Hope this helps 😀
Cheers
