Hello Kirashinnathrun,
Welcome to the community!
You should note these forums are community-driven and not intended as a venue for customer services. We do not have access to customers' accounts nor would we be able to adddress your issue.
I understand your device might have some compatible bands/frequencies for LTE. However, 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). Adding an IMEI of an unsupported device would not allow voLTE and/or Wifi-calling to work.
Without voLTE, calls and text messages (SMS and/or MMS) would fall-back to the '3G' network. 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. However, I am not aware of any official stance from Fido or Rogers on the matter.
Hope this helps 😀
Cheers
