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Old November 15th, 2011, 10:36 AM   #7 (permalink)
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Unhappy My conclusions

While Josh's assertions seem definite, I think they are wrong. My final assessments (as of now) are the following -- please correct where / if I am mistaken.

  • 3G (or 4G) will not be possible on either the ST18a or ST18i. It requires 1700MHz and 2100MHz, and then T-Mobile needs to allow phone compatibility. (Ref: hxxp://
  • If the phone is allowed to roam onto AT&T (this is tower-to-tower dependent), it will only get 2G, even if the tower is capable of 3G on non-1700/2100 frequencies. The restriction on speed is based on the roaming agreement between T-Mobile and AT&T.
  • The last (and possibly only) Xperia that had 1700MHz was the X10. I do not know if that phone was able to get 3G on T-Mobile.

Some speculation for future -- if/when AT&T acquires T-Mobile bandwidth allocation over the various frequencies may be modified. Maybe the only good news is for T-Mobile customers is for those who buy the Xperia Arc ST18a. (Ref: hxxp://
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Last edited by onyx; November 21st, 2011 at 06:29 PM. Reason: English grammar
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