她的电话号码是123用英语怎么说

Her phone number is 123 in English.
The source of this is the standard way of writing phone numbers in many countries, where numbers are used to represent each digit of the phone number.
Example sentences in English:
Can you please give me her phone number?
What is your phone number?
Can you repeat your phone number, I didn't catch it the first time.
Example translations in Chinese:
能告诉我她的电话号码吗？
你的电话号码是多少？
能再说一遍你的电话号码吗，我第一次没听到。