I think your phone is locked with a particular network. I suggest you can approach Classicunlocking.com and specify the country,locked network of iPhone 5C.Based on the availability you can get the permanent unlock service along with free instructions.
You have to decode the phone in order to use all sim cards
Testimonial: "how"
Make sure sim card is seated properly
remove sim card and gently clean gold contacts with a pencil eraser or qtip dipped in alcohol..let dry be for re inserting
contact service provider and have a new sim card sent to you
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