If your card is Barclaycard then they do freeze unless you advise in advance of travel abroad and to which county/countries, others are very possibly similar but not all. My advice would be to buy a phone card (some call it calling card, e.g. Americans), a pre-paid card which allows you to phone landline to landline using an intermediary number (see instructions with the card). Before you buy, do a comparison on minutes per euro for calls to the UK (they vary considerably), then have a landline number handy so that in case you run out of credit you can at the start of the conversation give them this and ask them to call you back - do not use a mobile phone which is usually the most expensive way to call. An alternative to this is Skype, if you have access to the internet you can usually set up your own account if you don't already have one - but you need to have a microphone and headphone/speaker set up (ideally a headset) then you can do this in relative privacy (depending on where you get internet access). But how to pay may be a problem because you need to have plastic to register when opening the account - if interested try it and see what you can achieve (I am unsure whether they may even do direct debit into bank accounts).