I purchased the S20 from Samsung. The website asks if you want unlocked or set to a carrier. I selected AT&T since they are my carrier. Now I'm trying to leave AT&T and for some reason they can't unlock it (getting the "Looks like the IMEI number you entered doesn't match an AT&T device). I've made multiple calls AT&T support and they suggest calling Samsung because they can't unlock it. Samsung says they have no way of unlocking it and to call AT&T. The phone is completely paid off, I don't know what to do. Literally just got off the phone with an AT&T csr who told me she would make a ticket and I'd hear from them within 48 hours. It took 5 minutes, I got an email saying "We are unable to complete your request at this time due to the following reason: The IMEI provided is not a valid AT&T IMEI". I can't seem to get anyone from either company to help. I don't know what to do and I'm beyond frustrated. How can I get this phone unlocked??
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However, AT&T still requires you wait fourteen days to make your request - AT&T must unlock it if locked ... so has the 14 day wait been satisfied?
Something to keep in mind - some phones destined for AT&T and T-Mobile don't include CDMA modems, so can't be used for voice service on Verizon or Sprint.
Also, have you done an IMEI verification?
2. download app PhoneInfo from play store for more info to help determine if phone is/has been rooted, verify imei,etc.