What phone does wind not have? hey have all the major ones, no?
At this point, I think they even support unlocked iPhones.
The thing is, Wind's network runs on AWS (same as T-Mobile in the USA), and not all phones support AWS.
Like, when the iPhone 5 came out, people complained to Wind, saying "why doesn't my iPhone work with Wind" and it was because Apple built the iPhone 5 without any AWS support (presumably because Verizon or someone paid Apple not to support it, in order to screw with T-Mobile). Apple eventually made a later revision of the iPhone 5 that did have AWS support, but they didn't change the name at all. It's still called an iPhone 5.
If you go into an Apple store to buy an unlocked iPhone, you need to specify that you want the version that works with Wind, otherwise it might or might not work. It's a crapshoot.
If you buy the phone from Wind, it's sure to work with Wind, because they only pick up the versions that work with their network. Also, T-Mobile. If you import a phone from T-Mobile, it will work with Wind.