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Further to your warning, here is a related cautionary tale. I walked the CP from Lisboa in April this year. In Coimbra I tried to take money out of a Santander MB ATM. They charge a very high conversion fee but offer the option to reject the fee and allow your home bank to convert the...
Vodafone Portugal sells a tourist SIM card for 25 euros that provides 10G, a bunch of local texts/minutes and some international texts/minutes. It is good for 28 days. I'm walking the CP now, in Pontevedre and can confirm it works fine in Spain. You can buy them in LIS.
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