A subscriber identification module (SIM) is an integrated circuit which is used to store the IMSI number. The SIM cards consist of memory capacities such as 32KB, 64KB, 128KB and 256KB. SIM cards are primarily used in GSM phones, CDMA phones, LTE handsets, and satellite phones.
There is an interesting move toward wearable devices as companions to smartphones and other mobile devices, such as smartwatches, health bands, glasses and smart clothes, which present a growth area for smart-card...