Network Strange Problem (Help!) - Galaxy S 4 Q&A, Help & Troubleshooting

Hello people,
My mother just gave me her Galaxy S4 I9500 and when i put my SIM card it wont connect to network. Im from Argentina, previously the phone was from Personal network but i have Claro. I checked with GalaxSim Unlock and its telling me that is network unlocked. I've tried lots of modems but i cannot get it to connect to the network. I also tried to connect via mobile networks but the i click Claro AR it says "Unable ot connect, try later" and the other two carrier says that " You SIM car does not allow this network"
One strage thing is that when i put a Movistar SIM it connects, but with the other two doesnt. My imei number is correct but its not the same as the sticker below the battery.
Can someone help me please?

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