As an AI language model, I do not have access to the latest information on the telecom market. However, I can provide you with some general information on the companies that have entered and exited the telecom market over the years.

From 1995 to 2022, several companies have entered and exited the telecom market. Some of the notable companies that have entered the market include Google, Amazon, and Facebook. These companies have entered the market with their own telecom services, such as Google Fiber, Amazon Web Services, and Facebook’s Internet.org.

On the other hand, some of the companies that have exited the telecom market include Nokia, Motorola, and BlackBerry. These companies were once market leaders in the mobile phone industry but failed to keep up with the changing market trends and competition.

In 2022, some of the major players in the telecom market include AT&T, Verizon, T-Mobile, and Sprint. These companies offer a range of services, including mobile and fixed-line telephony, broadband internet, and television services.

In terms of market leaders, it is difficult to determine without the latest information. However, in recent years, companies like AT&T and Verizon have been leading the market in terms of revenue and market share. These companies have been investing heavily in 5G technology and expanding their services to stay ahead of the competition.

Overall, the telecom market is highly competitive, and companies need to constantly innovate and adapt to stay relevant.