How to insert sample input on the field?

Hello , I wonder how to insert an example of entering a phone number on the "Phone Number" after the field " Network Code " ?

Simply insert a comma (,) in the input field of the Hint Example to separate the hints for Network Code and Phone Number. So for example you want to add 12345 as a hint for the Phone Number, you can add a comma after 999 and insert the number there. Here's an example below:

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