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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