I am thinking about renting a phone number instead of getting a new SIM card. I am not sure how it works or what situations it is actually useful for

Renting a number can be very practical if you need it only for a short time or do not want to share your personal one. People often use it for business calls, online services, or even travel when they want a temporary option. It usually works through providers that give you a virtual number you can manage from your phone or computer. I found a helpful explanation here https://esimplus.me/blog/how-to-rent-a-phone-number-complete-guide that shows the steps and reasons why this choice can be convenient