Previously, WhatsApp has allowed users of the encrypted messaging platform to link up to four devices to their account, but only one of those devices could be a smartphone. Happily, that's now changed, and WhatsApp has introduced the ability to use the same account on multiple phones. So now you can link another phone as one of up to four additional devices, the same as when you link with WhatsApp on web browsers, tablets, and desktops. Whether it's an iPhone or an Android phone you choose to add, each linked phone connects to WhatsApp independently, ensuring that your personal messages, media, and calls are end-to-end encrypted. Just be aware that if your primary phone is inactive for a long period…