Not it is not possible, the A2 is alone for modifications wing FS nothing of liberations. Pra to liberate it only for payment methods already SEtool Box 3 or for these methods:
Code:
   	
D-Ultimate Unlocker offers much faster and cheaper full direct unlock and relock of all existing A2, DB2020 & DB2012 and PDA DB2000/DB2001 Sony Ericsson mobile phones
Non-TP full security zone repair
Non-TP full EROM/SEMCBOOT repair
Unlocking via codes
CID change (downgrade/upgrade) 	1 LOG 24 euros	

More info.

Unlock your SonyEricsson by code
Everywhere in the world (every country, every provider)
No software and NO cable needed!
Every SonyEricsson model supported.
Not ANY technical knowledge needed
100% legal and keep your phone warranty!
  	
 More info.