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1) You want to jamyoo if someone has a WhatsApp account !
2) You want to Send Messages to your contacts via your WhatsApp directly from your tablet or from your phone without SIM card ...
3) You want to write "anonymously" via WhatsApp messages to all your contacts: no one can see your ID.
( Anonymously means without connect to our WhatsApp account)
There are almost everything you could do like jokes to your friends through JAMYOO! Or simply, check if they answer to people they don't know ...
JAMYOO is a FREE app!