[Q] Can't Unlock my phone:( topic

Hi people, well my problem is that I can't unlock mi phoneD: and I want to change my comany so... this happen:
I get my phone like 3 days ago and when I putted my sim (movistar) didn't work because it says that just accept telcel, then I tried to unlock it but I couldn't so I decided to upload to another rom (the first rom was 2.3.6 gingerbread) so I updated it to 4.1.2 JellyBean (The official one, by KIES) ok then I tried it on it, but it doesn't work nethier, it appeared a padlock and the only option was "Dismiss" then I read on internet that didnt work because I have to use a rom unofficial or I mean... a rom that doesn't belong to Telcel (Because when I turned on the phone always appeared the bootogo of telcel) then I uploaded to Kitkat 4.4.2, nightly, being exactly, this one: cm-11-20140324-NIGHTLY-i9100.zip I downloaded it from the official page of cyanogemod, then I installed. When I turned on the phone after install it It appeared and option like the one before, but this time its allowed me to introduce the unlock code, it said "SIM network unlock PIN" BUT I pressed dismiss, and I searched tutorials for unlock it again, but I couldn't D: all the tutorials I found include Galaxy S Unlock, Galaxy Sim Unlock, but any of the tutorials worked, always I restart my phone appeared that message "SIM network unlock PIN". SO..... what can I do?? D: I'm not sure but some tutorials said that I have to change the rom for another one but I want the one I have right now. Please help me :'(