The SIM card number, or ICCID, is a very important tool. It is a long number. This number is unique to your SIM card. It is like a serial number. This number helps your phone connect to your mobile network. When you first turn on your phone with a new SIM card, the ICCID helps the network. The network knows who you are and what services you have. This includes making calls, sending te... b2creviews.club