In order to use Whatsapp Web you need to be on the same wifi network as your phone.<p>Your phone has the data on it. Intranet speeds on most wifi networks these days is faster than 50Mbps. That&#x27;s more than fast enough to transfer all your messages and photos with little to no lag.<p>It doesn&#x27;t matter how fast your connection to the WWW is because you&#x27;re not using the WWW to transfer the data, you&#x27;re using the wifi intranet.