This is your 3rd one of these today. Let me restructure my answer for you that will be a little more helpful for future phones!

Here are the frequencies/bands that Koodo primarily uses:
2G: None
3G: 850Mhz (B5), 1900Mhz (B2) - (Both used for 4G in some regions as well)
4G/LTE: 1700/2100Mhz (B4), 700Mhz (B12/13/17/29), 2600Mhz (B7)
5G: None

Yes, this device is compatible with Koodo’s 3G and 4G LTE-FDD networks. Koodo does not operate a 2G network. 3G and 4G share Bands 5 and 2 (or 850MHz & 1900 MHz).

Edit: I didn’t see Allan_M’s post until I refreshed the page.

Thanks, apologies for the multiple requests, looking at options for a new phone. 

Allan does the, 'B' in your (B4) mean Band?

Oh 100% okay to ask multiple questions. Just figured that I would restructure my answer so that you didn’t have to ask and then wait for an answer every time!

And yes, the B would be short for Band.