First, I'd like to thank Koodo for the tool provided to inform potential customers whether their unlocked phone is compatible with Koodo's network: http://koodomobile.com/en/on/switch2koodo-step-1-a.shtml
That being said, this does have some drawbacks. You need to know the Canadian carrier carrier the phone was originally locked to. If the phone was factory unlocked, or if it came from outside Canada then you'll need the IMEI #. If you've already got the phone, then it's easy to look this up. If you're considering buying a phone and don't have all of the information, then you're out of luck. So, I'd like to provide people with a short guide to bringing unlocked phones to Koodo. If you're purchasing a phone elsewhere: 1. Make sure that the phone is compatible. Koodo's 3G network requires phones with UMTS-CLR (850 MHz) and UMTS-PCS (1900 MHz) operating bands. These bands will be listed under 3G, UMTS, HSPA, or WCDMA bands/frequencies. A phone having only one of these bands can work, but at greatly reduced coverage so I would only recommend buying a phone with both bands. 2. Make sure that the phone is either unlocked or that it can be unlocked. While most phones can be unlocked, this is not always the case. Specific carriers (Virgin UK, for example) don't provide this information. Even if the phone you're buying can be unlocked on one network, you may be out of luck on another. 3. If you're buying the unlocked phone in person (let's say through Kijiji, for example), pop in your Koodo SIM card to make sure the phone is unlocked. Check the phone's operating frequencies. Like i said in #1, only one of the two frequencies is needed to register on the network, but both are needed for optimal performance.