I am not sure why the other carriers SIM won't work. I am showing this device as completely unlocked. I even ran it through ATTs checker, and it comes up good to use.
Some phones work with some carriers, and some don't. Even if they are the same phones. The phone you are trying to use is unlocked. We can't make it work on another carrier.
Will you please resend the imei of that phone in a private message? I'll take a look at this and see what's going on.