The contest is called the "Mango-app" Challenge and in the fine print of the contest it says that the winners will receive a Windows Phone 7.5, the estimated value of which is $600. The model which will be sent out as a prize will be determined by Microsoft from a list that includes the Nokia Sea Ray, the Nokia Sabre, the Samsung Yukon and the Samsung Wembley. According to Mobile Syrup, the Nokia Sabre is a mid-range device rumored to have a 3.7 inch screen and use a Micro SIM card. WPCentral theorizes that the two Samsung models are variants of the Samsung Omnia W and the Samsung Focus S.
And wouldn't you know it, no sooner has the ink dried on our paper than Microsoft has pulled the original contest rules and replaced it with one that doesn't mention the four phones by name. Luckily, we have a screenshot for you to look at below.
source: MicrosoftCanada via WPCentral,MobileSyrup
These rules to a Microsoft Canada contest revealed the name of four Windows Phone 7.5 handsets before the names were removed