I have a very old sliding keyboard LG device (Model: LGIP-340N). Telus is upgrading to a 4G network & thus cancelling my service. I want to switch to Koodo. Can buy the S6 from Walmart, unlock it & use a plan from Koodo? Can I do this from a Walmart? Also, can I port my Telus cell # over to Koodo? I am in Ottawa, Ontario.