Latest iOS 12 Has Been Launched, After This WhatsApp The Facebook Owned Messaging Company Updated It’s FAQ Page. While WhatsApp Has Not Updated Its End Of Support Page Since June Of This Year.
On WhatsApp’s FAQ Page You Can Find That WhatsApp Requires iOS 8 Or Higher. And They Also Wrote That If You Are Using iOS 7.1.2 Then You Will Not Be Able To Make New Account Or Reverify Existing Account But If In Your Phone WhatsApp Is Active Then You Can Use It Till February 1, 2020. As Well As If You Have iOS 6 Or Older Than You Will Not Be Able To Use WhatsApp.
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It Means That If You Have Already Installed And You Are Using Whatsapp In iOS 7.1.2 Than You Can Use It In Your Way But There Is Not Any Update Will Be Available In Future For Your Phone. It Is Also Shown That Some Feature Of Whatsapp Will Not Be Available For Older Version Users.
If You Mistakenly Or Even By Any Reason You Uninstalled The WhatsApp Than You Will Not Be Able To Open Your Account In That Phone.