Carriers typically send these updates OTA (Over The Air) via iOS updates or Settings > General > About. However, sometimes you need to load a custom or leaked IPCC manually to force features that are not yet live in your region.
The first 7 digits of an IMSI identify the specific country and carrier (MCC/MNC). Entering this code manually tells the unlock chip which carrier the iPhone was originally locked to, allowing it to spoof the activation server. Step-by-Step Guide: Loading Settings via IMSI
If you are using a carrier-locked iPhone with a bypass chip and experiencing "LTE only" data or missing Hotspot, . However, for a permanent solution, you should check if your device is eligible for a free official unlock from the carrier before relying on temporary bundle injections.
Select the custom IPCC you want to load. iTunes will briefly show "Extracting carrier bundle" and then "Updating carrier settings."