Yes u can unlock T156 AYZ without open it
 

YES
u can unlock T156 new ( AY z ) without open

on jack u have

/12345\
_______
1: Gnd
3: box Rx/phone Tx (RJ45 pin-3)
4: box Tx/phone Rx (RJ45 pin-2) ( this value not present on new T156 AY Z ) only for this u need a TP cable



http://forum.gsmhosting.com/vbb/atta...1&d=1262342060


http://forum.gsmhosting.com/vbb/atta...2&d=1262343565

you are right 100percent.
i made the cable on the same theory.jus make a wedge like thing and insert under neath the covering over the test point