At the island available a few operators of mobile networks.
Most popular is Lebara, prepaid type mobile service, with good prices for calls and internet traffic. Maximal bundle is 20 GB traffic with unlimited calls costs 20 EUR.
Also popular virtual operators Digi, Hits and Llamaya
Two big operators – Movistar and Vodafone, national mobile operators, they are not use prepaid model, only contract for 1 year. Prices usually higher that Lebara, aroung 50-60 EUR/month, but with options like TV and home internet connection.