Subscriber identity module ( SIM ) cards typically hold subscriber and contact data and text messages. 用户标识模块(SIM)(SIM)卡通常会保存用户、联系人数据和文本信息。
Lastly, the paper introduces some results of the research and design of WCDMA mobile phone signaling software in National Mobile Communications Research Lab. Two main modules are included : non-access stratum ( NAS ) in network side and universal subscriber identity module ( USIM ) in UE side. 主要介绍了基站侧非接入层(NAS)和移动台侧通用用户识别模块(USIM)的主要功能、信令流程,并给出了设计方案和实现结果。
Research and Design on Subscriber Identity Module(SIM) Reader SIM卡读卡器的研究与设计