As 2G/3G networks sunset (e.g., AT&T 3G shutdown, Vodafone 3G sunset in Europe), older Huawei phones lose voice/text functionality. However, in regions where 2G/3G remains until 2028–2030 (parts of Africa and Asia), V4/V5 calculators retain utility.
VII.
Understanding the Huawei V4 and V5 Unlock Code Calculator by IMEI