SIM card (UIM card/PIM card) represents the only identity in the mobile communications field. It stores the customer information and encrypted key of the digital mobile phones, which can help mobile communications networks identify the customer identity and encrypt the voice information of the calls.
As a leader with extensive industry experience in the SIM card chip, TMC took the lead in 2005 in applying the flash technology to the SIM card, providing lots of customers at home and abroad with SIM card chips with a broad range of optional capacities and configurations. TMC’s SIM card chips are widely in the SIM cards of many domestic and foreign carriers including China Mobile, China Unicom and China Telecom. As of the end of 2013, TMC had shipped more than 2 billions of chips in total.