It means T-Mobile didn't sell that device.
T-Mobile's IMEI database only contains the IMEIs of devices they sold. If the device was purchased from ATT, Verizon, Google, etc, the device will not be in the IMEI database.
Thanks. I'm currently on a network in Dubai, UAE, called Du.
T-Mobile is, in fact, a partner network for roaming services, I'm assuming this should be some indication that the phone will work in the US?
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It's possible, but you'd wanna check with your carrier there just to make sure there's an agreement. our T-Mobile network page houses all the supported networks you'll need to be able to connect to in order to use the service while roaming here.