Sim locked or not

[INFIN1TY-NL]

How can i tell?

 

[shmsnh]

Other SIM cards won't work if the phone is locked to a particular SIM.

 

[INFIN1TY-NL]

If i had a sim, i would try. Any other way to see it? T Mob says its unlocked (all their phones are except prepaids) but i am not sure.

 

[INFIN1TY-NL]

 

[sdreamer]

How to SIM unlock the Nokia Lumia 1520 from AT&T | Windows Phone Central check step 4