I JUST e-mailed Sony Mobile and made the request via chat too for them to PLEASE add Band 71 for us T-Mobile customers on the XZ4. If you have T-Mobile, I HIGHLY suggest doing the same!!!
E-mail:
marketinginquiries@sonyusa.com
Site to make chat request: (Just choose XZ3 from drop-down menu and then clarify you are making the request for the XZ4)
You can copy and paste this as well if you like (I invite EVERYONE to do this for BEST reception!!!!!)
Subject: Request to Add Band 71/600 MHz to Upcoming Sony Xperia XZ4
Hi Sony Mobile,
I would like to make a formal request that you PLEASE add the Band 71/600 MHz radio band to the upcoming Xperia XZ4 phone when it's released. I have T-Mobile, and they have just activated & deployed this radio band all around the country, including my area, which is Chicagoland. Without it, my phone would not work as well as other competitor phones would that do already offer Band 71.
The U.S. XZ3 did NOT have Band 71, but it had all the rest of the T-Mobile bands, including VoLTE, of which I'm truly grateful for! But PLEASE PLEASE add Band 71/600 MHz capability to the XZ4 as I am very interested in buying it!! Doing so would show your U.S. customers that you truly DO care about us!
Thank You,
Your Name