[Q] Will WhatsApp message go through to a person who doesn't have your number stored?

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http://forum.xda-developers.com – I have a Blackberry and sent a message through the latest version of WhatsApp to someone who may not have my number stored in her phone (i.e., with a name attached to it). Would the message go through if she doesn't? Would she have received an option whether to accept or ignore a message from a random number? (HowTos)