Since yesterday afternoon I am unable to launch my WhatsApp on Lumia 640. I tried reinstalling and even factory reset the phone but it's not opening. Please help me fix it.

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    What version of OS is your phone running? Did you get any error message? – Kolappan N Mar 30 '17 at 14:18
  • Am Running Windows 10 os and have not being receiving any error messages just refuse to open please help me fix because am missing a lot of information so please help me out – Vicent Mar 31 '17 at 18:17

Try these steps to fix your connection. They're from the WhatsApp FAQ and are written for Android, but the basic steps should apply to Windows phones as well.

  • Restart your phone, or turn it off and on.
  • Update WhatsApp to the latest version available on Google Play.
  • Open your phone's Settings app > More > and turn Airplane mode on and off.
  • Open your phone's Settings app > Data usage > and make sure that Cellular data is turned on
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Make sure that your time and date of your phone is correct.

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