Facebook for SIM, also called LinqUs Facebook for SIM, is a client/server SIM application developed by international digital security company Gemalto that enabled people to access Facebook using the SMS protocol on their mobile phones, without needing a data plan. Facebook cooperated closely with Gemalto in the development of the product. Carriers that were partnering with Gemalto to offer this service included Entel in Chile, Tigo in Colombia, and Telecom Personal in Argentina.