[Q] Purchased Online (Unlock Failed):

I purchased a Galaxy S7 online, came with a T-Mobile receipt showing the device is paid in full, upon my request the original owner used the unlock app to request a permanent unlock before shipping and it was successfully unlocked. I received the device about 3 days ago everything works as it should, I opened the unlock app just to double check and requested a permanent unlock again and got this message (Unlock Failed: This mobile wireless device is not eligible for unlock etc...) I know the device is unlocked I tried an inactive AT&T sim and did not request a code. Anyone can tell me why the unlock app does not recognize that the device is unlocked, thanks in advance.

Purchased a S5, can you please identify the Model number?

I am very confused, Item is a refurb, has been rooted and therefore i want to put a clean stock rom on it, however i am getting mixed signals. phone is labelled g900f on the sticker and about phone, however i think this is fake, so the seller could sell it as a British model, I went in to recovery, the boot-loader stated it was a g900t. Also in the settings / about / there is a section referring to The united Emirates, which i have not ever seen before. I do believe it is a real s5 though as it has a snapdragon processor. Also the Imei number and serial number match the sticker, however i have a feeling this was somehow done by the seller, or who ever is supplying the seller who sold it to me. Other than that phone is working fine, but does not receive OTA updates. Also for some reason in the Ringtone section there are some built in AT&T ones.

can someone try to make sense of this, and tell me which exact Official ROM i would need to use.

Thanks.

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purchased locked phone.

So my girlfriend just purchased an S6 (sprint) and when she took it to the store to have it activated they couldn't do it because it was "locked"...some kind of carrier lock I'm assuming.. Like they owed sprint money or something? Obviously if it was a normal security lock than we could just do a factory reset but apparently that won't work.
So.. Anyone know anything about this and a way around it? I'm a Verizon user and have never heard of this kind of problem. Thanks for any help in advance.