In terms of coverage, Movistar is clearly the best with Vodafone not too far behind. Amena's coverage is less reliable in some areas, in particular out of major cities, but this is improving. In terms of rates, the case is exactly the opposite with Amena in general offering the best deals, followed by Vodafone and then Movistar.
Check out each mobile company's website for a list of rates and services:
The Phone House has conveniently compiled the rates of all the operators in one place. Pick up a copy of their brochure (the rates are in the back) in one of their stores or go to their website (only in Spanish):
www.phonehouse.es/commerce/servlet/eses-companyinfo-Networks
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