XDA - 'unlocked'

  russ-rich 19:44 03 Jul 2004
Locked

I have an oldish XDA 1 which I intend to put on ebay but I see other people when selling an item such as this saying it is 'unlocked'. What does this mean and is it good or bad to be unlocked?
I used it previously via pay as you go from O2 but it now has no sim card - I have transferred the number to another phone

This thread is now locked and can not be replied to.

Elsewhere on IDG sites

Alienware 17 R4 2017 review

Illustrator Sylvain Tegroeg created thousands of intricate line drawings for the mobile game…

Best iPad buying guide 2017

Comment télécharger une application indisponible en France ?