A roaming charge is an additional cost that you must pay on top of your standard phone minutes, SMS and data allowance when you use your mobile phone abroad. For example, you will likely have to pay more to call a UK number from outside of the United Kingdom than you would when calling from within the UK. The roaming charge that you have to pay will depend on your phone plan provider. Data has the most expensive roaming charge, although you will also have to pay extra per minute on a phone call or per text. You might be able to purchase a bundle that allows you to make a certain amount of calls or texts from outside the UK without paying additional fees. However, once you reach this limit, you will have to start paying per call or text. It's recommended to contact your phone provider or compare deals online before travelling abroad so that you don't face large charges. Alternatively, you could message and make calls through apps that use an internet connection.