What’s the tapping sound you sometimes hear when calling a cellphone?

Question : What’s the tapping sound you sometimes hear when calling a cellphone?
You know how sometimes when you call a cellphone, you’ll hear this continuous tapping sound while the cellphone is located before you actually hear the ringing sound (or ringback tone if they have one)? Is it anything specific? Or just what you hear while it searches for the phone
It’s during that pause before it actually connects to ring the phone
call tapping

Best answer:

Answer by Mr.Longrove
Never heard such a thing.