"Can't talk, WhatsApp only" typically means that the person prefers communication through the messaging app WhatsApp rather than through phone calls or other means of communication. WhatsApp is a popular messaging platform that allows users to send text messages, make voice and video calls, share media files, and more.
When someone says "Can't talk, WhatsApp only," it could mean a few things:
They might not be available to take a phone call at the moment but are accessible on WhatsApp and can respond to messages there.
They may prefer text-based communication over voice calls due to convenience or other personal reasons.
They might have limited talk time or phone call availability, so they prefer to use data-based communication through WhatsApp instead.
They might be in an area with a weak cellular signal but have access to the internet, making WhatsApp a more reliable means of communication.
They could be more comfortable expressing themselves through written messages than talking on the phone.
Overall, it's a way for the person to let others know that they are reachable on WhatsApp and that they prefer to use that platform for communication at the moment.