How to send a telegram, viber, whatsapp message without bots? PHP?

Question

PHP

Is there any api with which you can send messages to people knowing their phone number?

Answer 1

This question is asked here regularly.
Telegram - nothing at all. Let the necessary users subscribe to the bot, and then you can send them by user id.
Viber - paid and quite expensive through Viber Business Messages, the price of one message is no less than SMS, plus the minimum monthly payment is quite large. Business access only. In the same way, it's easier to make a bot and send by id.
WhatsApp - there are no free bots legally provided at all, but you can call the phone number is also quite expensive through many intermediaries. Again, business only. Basically, this is also sold with a mandatory minimum payment, but here at least some (for the same twilio) have tariffs without a subscriber, with payment for each message. You can also risk illegal methods through WhatsApp Web emulation.