I purchased a SM-N915T from Amazon. When I powered it on there was no T Mobile logon or bloatware. I checked to see if has been rooted using Terminal Emulator. I had a $ so I typed su and it came back as a $ indicating that the phone hasn't been rooted. I emailed the seller and this is what he told me "Because this phone is the samsung original OEM. It carries all the same specs for T-mobile but this is not the T-mobile phone (not locked to T-mobile)" I will be using a AT&T sim card. And it looks like I'm not getting 4G LTE. So what is going on here ?