If you are using a Symbian or Java (J2me) enabled phone you may encounter Certificate Expired error message while trying to use WhatsApp Application.
To resolve this error :
1. Check that the System date and time is set correctly.
2. If it is correct yet you face the issue , try updating the system software.
Step 1 worked for me ( the system date on my phone was set incorrectly)
❗️ This is an old post and may not be recent in recent tech advancements!
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