Been with Koodo for years. Have an iPhone 15 (purchased last year from Koodo) on iOS 18.1 with an eSIM. Have a 5G plan (but where I live there is little 5G coverage so mostly on LTE.). Around 5 pm Atlantic time I noticed I had 3G service. This has persisted since then. I have turned airplane mode on and off multiple times, restarted my phone 3 times and reset network settings with no resolution.