If the mobile phone number is known, you can send a link via SMS.
If not, send the link via email. It also provides a link copy function, which allows you to pass the link to other communication tools such as chat via copy/paste.
When sent via SMS, just enter the mobile phone number and an SMS with a link is sent. Connection will be established directly by tapping on the link from the text message.
When sent via email, just enter the address and an email with the link will be sent. Check the email on the phone and access the link to get connected.