Another tried and tested method of cheap communication
is when you open a Skype account,if you have an iPod get a pair of earphones with a mike as per an apple phone, download Skype to the iPod and when you go ashore and hook up to a wifi connection you will get around 45 minutes good quality phone connection.
The iPod in a little water proof bag has the advantages of less likely to attract attention from thieves, easier to carry and I found it to have better sound quality than my PC.

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