Whatsapp Phone Number Not Working

Hello Everyone,
When today i wokup then i found that my Whatsapp phone number is not working. I don't know what is the reason. I discussed with my friend who told that may someone hack my Whatsapp... Ohhh Seriously..
Can anyone help me know how can i recover it as soon as possible?
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reinstall your Whatsapp, reboot your smartphone and again install Whatsapp enter your previous number which is associated with it and backup your previously cloud-stored data.