I recently purchased a Sony Xperia 5 IV XQ-CQ54 from the UK. The phone works great with everything (with the exception of lacking the bands for 5G). My only problem I am encountering is the fact that Telus still uses the archaic process of only allowing or whitelisting specific devices for WIFI Calling.
This means if you are not purchasing an authorized device make/model (which is generally limited to ones they have sold or currently sell), the features will not be accessible. This is not a limitation of the phone, but rather a conscious choice by Telus.
Please consider opening this functionality up to all devices - a simple "not officially supported" caveat would be preferred to the approach of using a whitelist. Other Canadian carriers support this, and many in other countries do.
It's not an archaic process, it's the fact it's not an officially supported phone. Both in terms of hardware, software, security or technical support. When you purchase these phones the onus is on the end user, it's to be expected certain feature will not work.