Of course you can still contact them, but it will be harder and people will include you less in their conversations. Whatsapp does a lot more than what regular

Of course you can still contact them, but it will be harder and people will include you less in their conversations. Whatsapp does a lot more than what regular sms does, including working video calls across platforms, working multi-person chats with file attachments, etc. Don’t say e-mail does this, it doesn’t, as you will need more than a phone number that you already have. Here everybody asumes that you have it, if you don’t, you’re on your own. As an example, my communication with my car insurance company over an incident I’ve recently had is happening over Whatsapp.