This European Telecommunication Standard (ETS) specifies the form@ dimensions and position of an edge indentation for a single standard tactile identifier for machine readable ID-1 type telephone prepayment cards and GSM telephones SIMs@ i.e. cards which otherwise conform with the ISO standards for machine readable ID-1 cards@ and to specify the test procedure for verifying conformance with this ETS. This tactile identifier is meant to facilitate the correct orientation and insertion of telephone prepayment cards and SIMs in the card-operated terminals@ especially for people who are blind and visually impaired@ but also for older people@ minors and other users. This ETS does not apply to telephone prepayment cards which do not require to be inserted in any specific orientation in the terminal nor to plug-in SIMs or to Thin Flexible Cards (TFC-1). National differences in the delivery of instruction material to blind and visually impaired people places the provision of packaging@ labelling and instructions in the use of telephone prepayment cards and SIMs outside the scope of this ETS.