No, the phone will not be compatible with Koodo. Telus and Koodo do not operate a 2G GSM network. For the phone to work, you would need to see Bands 5, 2 and 4 or 850/1900 MHz & 1700/2100 MHz (AWS). Japan uses Band 6 for 850 MHz but utilizes a different set of uplink and downlink radio frequencies compared to that of Canada's Band 5/850 MHz. There's no LTE either as the frequencies for that band are incompatible. Koodo operates on the TELUS network.