Phones in Spain

The question was:

My girlfriend and I are planning to do the Camino in April and are thinking that at some point we may spend time walking alone. What I would like to know is if anyone knows if we can rent phones so we can call each other while in Spain. We won’t need the phone to call home(U.S.), or any place outside of Spain. We don’t want to use our own phone, but are hoping for a local inexpensive service for a month in Spain.

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