You can register your travel plans with the Foreign Office prior to departure using the LOCATE service, which provides all of the details to the Embassy and helps them contact you in an emergency. If you ask your mahal to buy you a local I'm card before you arrive you can register the number and also pass it to family and friends so that you can keep in contact cheaply.
http://www.fco.gov.uk/en/travel-and-...g-safe/Locate/