An IP address does not change with a SIM card. The IP address is assigned by the mobile operator’s network, specifically by the GGSN (Gateway GPRS Support Node) in the case of 2G and 3G networks, or by the PGW (Packet Gateway) in the case of 4G networks.
When a device connects to the mobile network, it is assigned an IP address from a pool of available addresses. This IP address is used to identify the device on the network and enable communication with other devices and services on the internet.
The assignment of IP addresses is typically dynamic, meaning that the IP address assigned to a device can change over time. This is similar to how our computers get assigned IP addresses when connected to a LAN or Wi-Fi network.
However, the change in IP address is not directly tied to the SIM card. The SIM card is primarily responsible for identifying the subscriber and providing access to the mobile network. It stores information such as the subscriber’s phone number, authentication keys, and network preferences.
The IP address assignment is independent of the SIM card and is managed by the mobile operator’s network infrastructure. The network assigns the IP address based on availability and other factors, such as the location of the device and network congestion. So, even if you were to switch the SIM card to another device, the IP address assigned to that device would still be determined by the network.
It’s worth noting that there are cases where a device may have a static IP address assigned to it by the network. This is more common for business or enterprise customers who require a fixed address for specific services or applications. In such cases, the IP address would remain the same regardless of the SIM card used.
To summarize, the IP address assigned to a device is not tied to the SIM card but is assigned dynamically by the mobile operator’s network. It can change over time based on network conditions and availability.