I got an LG Nexus 5 from Koodo and my tab is completely paid off. Do I have to unlock it (pay 35$) to use it on another network / country? Recently I used Roam Mobility and Telgo SIM cards without problem when traveling to the US. So I know it can work on other SIM cards. Just want to make sure that this was not just a US-Canada thing and that I would be able to use it in other countries too. Thanks.