PalmOne is offering an upgrade to the software for Treo 600s. The original software version on my unit is Treo600-1.08-INT, but my phone is unlocked. I currently use it on AT&T due to company policies. When contacting PalmOne tech support regarding which version of the upgrade software to use, they instructed me to use the T-Mobile version, but that it may re-lock the phone. This phone was supplied unlocked out of the box. Why would the upgrade lock the phone to T-Mobile.

I am leary of upgrading until I am clear that the phone will not be locked after applying the upgrade software. Can anyone shed any light on the subject?