you can change the phone number to ur new phone without losing any data

Unfortunately, Telegram requires a phone number to create an account and to log in. This is because Telegram uses your phone number as a unique identifier to ensure the security of your account. However, if you're going abroad and don't want to use your current phone number, you can still use Telegram by getting a new phone number in the country you're visiting. You can then use this new phone number to create a new Telegram account and log in. Alternatively, you can use a virtual phone number service that allows you to receive SMS messages and calls without a physical SIM card. There are several virtual phone number services available online that you can use to create a new Telegram account. It's important to note that using a virtual phone number service may not be as secure as using a physical phone number, as virtual phone numbers can be more easily spoofed or hacked. So, it's important to take extra precautions to protect your account, such as enabling two-factor authentication and using a strong password.