Mobile roaming allows you to use your mobile phone to make calls, send texts, and access the internet while traveling outside your home country. This service enables you to stay connected without needing to change your SIM card or phone number. Roaming agreements between mobile network operators ensure that you can use your phone in different countries. When you roam, your home network charges you for the services you use abroad, which can lead to higher costs. It's important to check with your mobile carrier about roaming rates and options before traveling to avoid unexpected charges.