Hi Everybody! Im having a very weird problem with my unlocked iphone 4. First of all, i would like to apologize because of my english, is not very good. My native language is Spanish. Well.. Im from Mexico, and here we can buy the iphone Unlocked on the Apple Online Store. Here's my problem. Apple has exchanged my iphone 3 times. I returned the iphone the first time because the screen was totally yellowish, other than that everything was working great!, that was by the end of September. On October 20th, i recieved my second iphone, and then a bigger problem started . Before i continue, let me give you this information: here in Mexico we have basically 3 cell phone companies 1.- Telcel 2.- Movistar 3.- Unefon OK, now on october 20th, i recieved my second iphone, and then procced to activate via itunes using my UNEFON sim card (microsim). And every time i tried to activate it, only got this message onscreen: I though somethings wrong with my brand new factory unlocked iphone 4. I have 4 more simcards from my brothers (they all had iphone 4 too) I tried telcel sim card, and i could activate my iphone. Then i insterted the Movistar microsim, and it worked too!! But then when i put the Unefon sim, the itunes logo inmediatly appears on the screen asking to activate on itunes, and when i tried that, the only response i got was the image above saying " The Simcard inserted on this iphone does not appear to be supported" Weird thing here is, that, when i put my Unefon sim card on my brothers iphone 4, it worked great! on all of them, internet 3g, phone, wireless , evrything! I called apple support, and they exchange the iphone for another one. I recieved the third iphone on October 29. Last friday. and guess what? SAME PROBLEM! different serial number, same week production (week 42) but exactly the same message on itunes. Very, very frustrated, i called apple again, and after 1 hour with thechnical support, they told me " We are sorry, but we can only offer you, your money back, NO MORE EXCHANGES FOR YOU" I said why?... i dont want my money back! i want an UNLOCKED iphone!, but they refuse to give me another iphone. When i asked techincal support, why my unefon sim card worked great on all three of my brothers iphone but not on mine, he just told me, "I really dont know, i guess they just got lucky" damn, this answer put all my trust i had on apple products for years, right on the garbage. Since they refused to give me another iphone, i accepted my money back, and inmediatly after i finished the call, i asked my brother to buy me one more time an iphone 4 using his name, and his credit card. Now i have to wait until November 8-12 to recieve my new iphone, hoping this time i get a REAL UNLOCKED iphone, and not a partially unlocked iphone. btw. i even went to Unefon costumer service and bought a new prepiad line, with a new microsim, just to be 100% sure that this problem is not because of the sim. And again didnt worked on my iphone, but it worked on any of my brothers iphone4. Serial numbers of the 3 iphones: 79039C0U*** (this one worked great with Unefon, only problem was yellow screen) 85042GR4*** 81042FJB*** What do you suggest me? any info would be really aprecciated FYI i also restore 4 times the last iphone and nothing seemed to work, i use 3 different computers, Macbook Pro, iMac, and an Hp with Windows 7, and the same message on all three computers. Wierd thing also, one of my brothers bougth an iphone 4 this last week too, but he bought the 16Gb not the 32Gb. His iphone production week is 42 also! and when i put my Unefon sim in his iphone works great! I dont know what else i can do, I just need to have faith that my new iphone coming this november will be real unlocked, but what if i'll recieve an iphone and then the same problem?? time for android? just kidding really guys, what can i do? anyone with similar problem like me? i dont wanna use Telcel or Movistar, i wanna use Unefon, and thats why i bought an Unlocked iphone btw: jailbreak is not a solution for me, because i always like to use legal software on all my apple products, and because of the warranty.