Treo 650 Subsidy Unlock Code

Guys,

I requested a subsidy unlock code from Cingular for Treo 650 and they
forwarded that to me couple of weeks ago. Now, when I apply it (Phone
- *#*#<code># - Phone), it tells me the sim card is unlocked. The
problem is that when I try using the Tmobile sim card, it gives me the
following error:
Error Messages
"Your phone cannot be used with this SIM card."

Also, when I look at the instructions on unlocking the unit, it
mentions that If this process is unsuccessful five times in a row, the
phone will be permanently locked to the Cingular network. Is this true?

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ASIM we will not challange palm or Cingular. but make sure you phone is not black listed( mean not reported as stolen) or other possibilty is you have refurbished phone. recently palm is programming only one code for unlock in refurbished phones. if you are in GTA toronto AREA may be we can help you.
we have professional equipment and our technichain may unlock your phone. if you are not in canada visit our website www.cellularclinic.com and check postal unlocking service.