How can i know if a number have account on whatsapp or telegram like this image?

how can i know if an number have an account on whatsapp or telegram?
can i know it with any api or any extension ?

Only telegram

but how please tell me

can u explain?

you might want to try the answers here

or do a Google search...
let us know, what you find out...


tnx this link is very useful but im new at this, so can you show me any block ?