Simyo is a mobile virtual network operator (MVNO) that offers prepaid and postpaid mobile telecommunications services, primarily in Spain and the Netherlands. It provides a range of mobile plans that include various combinations of data, voice, and SMS services, with an emphasis on flexibility and low-cost options. Users can often customize their plans according to their needs, choosing the amount of data, minutes, or texts they require. The service is known for its straightforward pricing and no-contract options.