If you are traveling abroad, it is not feasible for you to carry only the SIM card of your local provider. You may find some international roaming packages with your cell service providers, but still, these are costlier options to communicate with people when you are in a foreign country. Often people calling you may have to pay more themselves.
A feasible and affordable option for you is to look for the best International Sim cards. You can check different international Sim providers, compare their call rates, and data roaming packages, and then decide the Sim that is suitable for your needs.
You can check customer reviews on International Sim providers to make an informed decision when buying the Sim card. Another option is to ask your family and friends, especially those in your circle who frequently travel abroad. These people can advise you on the best SIM card to use when you travel internationally.