If you bought the phone second-hand or don't want to deal with carrier customer service, professional unlock servers can generate the V5 code using your IMEI.
This is the modern standard for many Huawei handsets and mobile hotspots released between 2014 and 2018. huawei factory unlock code v5
Insert a (e.g., if the phone is locked to T-Mobile, insert a Vodafone SIM). Power the device back on. If you bought the phone second-hand or don't