US GSM & Verizon iPhone 6/6 Plus Service Policy

I bought a phone in 2015. I used it for a year and the phone stopped seeing the SIM card. I took it to repair and the phone worked again for a year. After that, my husband bought me a new phone.

Today they took the phone for repair to give it to my mom. The master told me that the phone was locked by the operator. How can I restore my rights to my phone?

Model: iPhone 6 128GB Silver Cellular [A1549] [iPhone7,2]

Serial Number: FD***5ML

Activation Status: Activated

Warranty Status: Out of Warranty

Warranty End Date: 2016-01-12

Refurbished: NO

Find My iPhone: ON

iCloud Status: CLEAN

Blacklist Status: CLEAN

Locked Carrier: US GSM & Verizon iPhone 6/6 Plus Service Policy

Country: US - United States

Simlock: Locked

[Personal Information Edited by Moderator]