Where can i find mask for my IPhone 4g?

So my brother bought me an IPhone 4g from Germany he's coming home in like 2 weeks my question's where can i find a mask to order online and if IPhone 4g is same like Iphone 4s or the iphone 4? What is the difference between those anyway idgi?

You can GAICFA but they're kinda WBTSE. The only RDIA iphone 4 has GECJGRS and the 4S also has GECJGRS, but also ITDVI. So any iphone 4 CSFTOAW.