I just want to tell you (without the snobby attitude of some on here) that they are in fact WRONG. A lady at work here asked me to Root her phone after seeing mine. I got mine last June, ordered in May. So I know it is AMOLED. She bought hers in late September/Early Oct. Not sure which. Since I was concerned about rooting without knowing if it was SLCD or AMOLED, I was wondering the same question, how do you tell the difference. Her markings are ALL the same as mine. There is no 3 anywhere. They both say ARD6300VW. By the posts earlier, mine came with the 2gb card. No VW2. Hers is CLEARLY a SLCD screen. No 3. Of course her box is long gone as it was cut up for the rebate anyway. The only way I know hers is SLCD is because side my side, the colors on my screen are far more brilliant. It's almost as though her screen looks faded. All the settings were set the same so I know it is clearly the hardware.
For those with the condesceding attitude, I suggest you don't try to answer others questions. Especially when your answers have no value.
Also the link on how to tell the difference, offers no answers.....unless you have a phone OF THE OTHER HARDWARE to compare it too. The question was, how do I know which model I have. Without one of the other kind to compare it too, there is no way to tell. No markings, no nothing. A good rule of thumb though is if you bought it September or later, it is probably safe to assume that it is SLCD, As they no longer make the AMOLED. Samsung is the only producer for them and with the phones being that in demand, production will never keep up with supply. I think even the EVO switched to SLCD didn't it?