People often have phone conversations in public because it's convenient. Sometimes, they need to communicate immediately, no matter where they are. With busy schedules, finding a private moment can be tough. So, they might make calls while on public transport or in waiting areas to save time and address urgent matters.

Sometimes, people don't have a private space to make phone calls. They might live in shared accommodations or crowded homes where privacy is hard to come by. Even workplaces might lack private rooms for calls. In such cases, public places become the only option for having conversations.

Social acceptance plays a role in why people have phone conversations in public. In some cultures, it's normal to hear others talking on the phone in public. Plus, public spaces are usually noisy, which can make conversations feel more private. With mobile technology being so common, public calls have become a normal part of life.