how to unlock a huawei modem

{"cid":"91211296","title":"HUAWEI E3131 3G USB Stick Modem Unlocked GSM Broadband Modem","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/b7\/e2\/db8ad6ae38e0788aced17a46ec70-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"Huawei","Model Number":"E3131","Minimum Order Quantity":"Negotiable","Delivery Time":"3-8 work days","Place of Origin":"China Guangdong","Certification":"CE ROHS","Packaging Details":"Standard gift box","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram","Supply Ability":"100000units each month","Type":"Cellular Antenna, Wireless","Polarization":"Vertical","Name":"3G LTE Antenna","Product name":"Huawei 3G Modem","Gain":"5dBi","Color":"White","Weight":"30g","Dimension (mm)":"12*10*8(cm)"}}

{"cid":"91208892","title":"Huawei Mobile 4G Router WIFI 3 Unlock Wireless Modem 2100mAh","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/08\/72\/c67fabdbdccef03e1c31de1d26cb-200x200-1.jpg","attrs":{"Price":"17.5-20","Brand Name":"Harvilon","Model Number":"MF833L","Minimum Order Quantity":"100","Delivery Time":"5-25days","Certification":"CE ROHS 3C BIS","Place of Origin":"China","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram","Supply Ability":"10000pcs per month","Packaging Details":"10*4*8CM","LED":"4 LED Lights","Standard":"802.11 b \/ g \/ n","Size":"59.5*93*10mm","Battery":"2100mAh","standby time":"more than one week","warranty":"12 months","Wifi speed":"MIMO 2 * 2","WiFi Rate":"150Mbps"}}