How many 5GHz wifi bands iPhone XR supports?

I recently got a router with tri-band, one 2.4GHz and two 5GHz band, I can only see the 2.4GHz band and one of the 5GHz band(I set the SSID different from these three bands). But I noticed one of a 5 year old wifi camera I have can see all three bands(SSID). So I don't know if it's just because Xr doesn't have that band or there's any setup problem with the phone. TIA