[Q] Problem with my Nexus s "Sim locked"??

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http://forum.xda-developers.com – Hello there, I'm a newbee in this forum. I'm facing a problem with my nexus s. I traveled to Turkey since fifteen days and bought a turkcell sim. It worked for about 10 days and then a problem happened. It seems my sim got locked. So, i couldn't connect to the network anymore. And when I searched for networks, I found all of available networks in turkey, but when trying to connect to turkcell network, a message appears on the screen "Can't connect to this network right now, try again later" my phone running in CM10.1. Can any one help me and lett me what to (HowTos)