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WHATSAPP is about to be blocked on millions of phones.

The November 1 deadline for the block is finally here – locking some iPhones and Android mobiles out of the chat app forever.

Any users affected by the block will need to update their software, or buy a new phone. It's possible that your handset may be too old to update, forcing you to upgrade.

More than 50 different smartphone models are expected to be affected.

The deadline for the change is November 1, after which point WhatsApp will stop working on those models.