Thanks for contacting HTC Technical Support Center in regards to the unlocked version of the HTC ONE.
Henry; we are glad on your interest on the new phone. Please check on the following link for the specs on this phone. That way you may decide if it is worth it for T-Mobile or not: http://blog.htc.com/2013/03/htc-one-developer-edition/
Thanks for your continuous support of our products and services. Should you require further assistance, please do not hesitate to contact us through http://www.htc.com/us/support/email-support or call us at +1-866-449-8358 from 8AM to 1AM, 7 days a week.
Have a great day xxxx
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這個開發者版本跟AT&T是最相容的 但T-mobile為了iPhone 系統跟AT&T的相容性越來越高了 特別如果是住在這以下幾個大城 Baltimore, MD; Kansas City, KS; Houston, TX; Las Vegas, NV; Phoenix, AZ; San Jose, CA Washington D.C. 就可以真的用T-mobile新的LTE網路了
Thank you for contacting HTC technical support; we are glad to assist you with your inquiries, for the HTC One unlocked version the network frequencies are exactly the same as the 64GB: HSPA/WCDMA: 850/1900/2100 MHz - GSM/GPRS/EDGE: 850/900/1800/1900 MHz - LTE: 700/850/AWS/1900 MHz (US)
Thanks for your continuous support of our products and services. Henry, please do not hesitate to contact us back through Email at http://www.htc.com/us/support/email-support or call us at +1-866-449-8358 from 8AM to 1AM, 7 days a week.
Have a great day!
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List of Cities with 1900MHz 3G from T-Mobile Ann Arbor, MI Atlanta, GA Austin, TX Baltimore, MD Boston, MA Cambridge, MA Chicago, IL Dallas, TX Denver, CO Detroit, MI Fort Lauderdale, FL Fort Worth, TX Fresno, CA Houston, TX Kansas City, KS/MO Las Vegas, NV Los Angeles, CA Miami, FL Minneapolis-St. Paul, MN Modesto, CA Napa, CA New York, NY Newark, NJ Oakland, CA Orlando, FL Philadelphia, PA Phoenix, AZ Providence, RI Reno, NV Richmond, VA Sacramento, CA Salinas, CA San Antonio, TX San Diego, CA San Francisco, CA San Jose, CA Santa Ana, CA Santa Cruz, CA Santa Rosa, CA Seattle, WA Springfield, MA St. Cloud, MN Stockton, CA Tampa, FL Tucson, AZ Vallejo, CA Virginia Beach, VA Warren, MI Washington, DC
Just called T-Mobile, due to their recent no contract change, you will have to pay the full price of HTC ONE, in $99 down, $20 monthly installments until you pay off the phone. Since they are don't have LTE for Los Angeles area yet, so I guess I will change carrier and buy it from AT&T with free wirelss HDMI adapter.