My husband and I will be traveling in the U.K. in April. We will be in and near London, Wales, and the Republic of Ireland. Our current mobile phone does not support international service, and I really don't want to change phones. We are going to be staying in the Earl's Court area in London. Is this correct? I could go to the Carphone location there and purchase a disposable phone and usage plan. Will this phone work in Wales and Ireland also?