STC has announced the launch of its Call Me Plus free service for all new and current SAWA prepaid customers. The move is part of STC's continuous efforts to provide subscribers with the best services and to offer a range of choices through its advanced and modern network. Call Me Plus can be used instead of an SMS when a SAWA subscriber with insufficient credit wishes to contact another number within our network. The addressee then receives a missed call notifying him/her of the number trying to contact him/her. This is an automatic service that requires no activation.
Source: STC Press Release