A: No it cannot. Using Mobile phones for mass texting is a violation of the fair use act by almost every major carrier so we don't support that type of sending. It can lead to HUGE fines (Up to $1500 per text message sent) so that's not something we would recommend ANYONE do.
The way we work instead is we give you step by step instructions for setting up your account with Twilio or Telnyx and then you connect that gateway to our platform. Messages are very affordable (less than 1¢ per segment in the US) and this way you stay compliant :)

I hope that helps bogdan!