The FCC filing from ASUS, above, reveals a PDA phone with the model 0100084.  Interestingly, the brand for this device is listed as ‘NA’ in FCC filings, and the FCC label for the 0100084 does not show any brand, either.  This suggests that ASUS is the OEM manufacturer for the 0100084, and the phone will likely be re-branded when it is released.

The test report for the 0100084 reveals support for 850/1900 GSM and WCDMA Band IV.  These frequencies correspond to T-Mobile’s service in the United States, indicating that the 0100084 may be a new smartphone for T-mobile.

Other than that, we don’t have much to go on.  If reports that the Nexus One will be released for T-Mobile are correct, then it appears that T-mobile will be making a big smartphone push in 2010.