Koodo Community

Unlocked LG G3 D850 - Emergency calls only

I recently purchase an AT&T lg g3 which is supposed to be unlocked.
I say "supposed" because when I put my koodo sim card inside, it doesn't ask me any code, it starts normally and even network strengh bars appear, but when I try to call it tells me "Emergency calls only".
Can't find koodo network when I do a search, and when I look into "INFO" it tells me that the phone is connected to an "unknown network"...
I checked the IMEI number, doesn't seems to be blacklisted...

Please help me, it's driving me crazy.