Still running 2.3.4 Android Version Help!!!!!

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http://forums.androidcentral.com – So I'm in Canada with Telus as my carrier. My Samsung Nexus s acted up and was crap so they sent me a new phone. Then my old one was starting to work again. So this phone sat in a box unopenned for about a year. Finally my original phone crapped out. So I have been using the new phone for a while now and have never received an update. I am not all the smart with phones so I need some serious help. Samsung tells me no updates available. Telus is baffled and says check you tube. Can someone out there tell me how/if I can update to the latest Android Version? Thanks. (HowTos)