A:Answer The MPN number is GA03923-US. My research has shown me that this is linked to model GVU6C, MPN number GA03523-US has shown me is linked to model GQML3. GVU6C does not support mmWave,(supports just Sub6), but the GQML3 does, along with Sub6. mmWave bands n260/n261 are not required for T-Mobile, but according to their device compatibility specs on their website, they use bands n260 and n261 for 5G UC, along with band n258. Tech specs are posted in the Google Store and also on the T-Mobile website. They are a must read. The device compatibility check with the IMEI number through the carrier website will also be of great help.