@ BandOfBrothers , Thanks for the reply and the suggestion to move to USA forum. It is a known fact that USA is well behind and quite awkward when it comes to mobile technology and service. This is due to many factors, but mostly to practically legalized monopoly of a few providers. I had experience with some generic unlocked devices, which are common outside of USA. These devices though work with US providers lack some of valuable provider-specific features like Wi-Fi calling. Another problem with them is that in USA Samsung relies on providers for devices’ support. Providers claim that they lack expertise to service not provider specific devices thus discouraging customers from buy such devices. I wholeheartedly agree with you that the practice of locking phones to provider is ridiculous, useless, and should be outlawed. My case of spending innumerable hours trying to resolve such basic problem is a stark and clear example of that. Thanks again for your suggestions.
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I am a AT&T customer in USA. In August I purchased a new Samsung Galaxy Not 9 AT&T edition. I requested AT&T to provide me with the unlock code so I may use local SIM cards when traveling abroad. AT&T had issued a 8-digit unlock code, which upon application returns "Invalid unlock code" error. AT&T says that they get unlock codes from Samsung. Samsung says that they have nothing to do with locking and unlocking USA providers phones -- it is all providers doing: they modify firmware and OS to their requirements, including SIM locking and unlocking. Stuck between to huge companies pointing fingers to each other does not help a consumer. AT&T had replaced the phone, but the new phone has exactly the same issue: issued unlock code does not work. After extensive reading online, I notice that some users say that unlock code should be 16-digits. I called back to AT&T and received a 16-digits unlock code. The first 8 digits of the longer code match the 8-digits code they gave me before. The new code had produced the same error: Invalid unlock code. Some people online mentioned using third-party service companies, but when I called youbreakifix, a USA certified Samsung service provider, they told me that they use the same source for unlock codes as AT&T. Have anybody was able to resolve the issue?
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