When we went to Ireland a few years ago, we went to a store in Dublin, sort of like a Walgreens, and bought a phone and loaded it with minutes. Just a junky little phone, and I think it was only about $30. But we were driving all over, and had to confirm our B&Bs every night, plus we were afraid of hitting a sheep in the middle of nowhere and needing a tow truck. The feasibility depends on where you're going, though.
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I thought getting old would take longer.