Simple Mobile, Inc. is a mobile network operator headquartered in East Irvine, California. They have more than 1.5 million subscribers, and they provide wireless voice, messaging and data services in the United States.

They are a T-Mobile MVNO reseller, offering pre-paid month-to-month plans including unlimited texting, voice, and data. The company currently does not have any cellular phones or devices available for purchase, instead relying on the customer purchasing their own phone, then using the company's SIM

Subscriber Identity Module

A subscriber identity module or subscriber identification module is an integrated circuit that securely stores the International Mobile Subscriber Identity and the related key used to identify and authenticate subscriber on mobile telephony devices .A SIM is held on a removable SIM card, which...

. They operate using GSM technology.