* purchased BB STORM9530 ' unlocked ' .
* inserted my old sim from an already active T-mobile account ;
* life was grand .
* All functionality of phone great !
* on day 1
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* day # 2 .... attempt to make a call on my phone and i get a
Verizon message that says cannot place call ; having difficulty
recognizing phone & or its registration ??
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suggestions ?

if i were you i would go to network setting an make sure it says GSM only not CDMA/gsm that might be the issue . i had that happen to me once when i first got a blackberry storm.

You say its a Verizon message so my assumption is you should have a Verizon Blackberry service including a BB data plan. It seems the message is telling you they do not recognize the phone as legitimately on their network. the phone does not seem to be unlocked

check this info

How do I determine if my BlackBerry is "unlocked"? - BlackBerryFAQ