Automation that works with Hubspot to send SMS to customer after site form is filled out .

Specifics: site form is Gravity forms, CRM is Hubspot (free) i'm trying to find a simple solution and not too expensive that'll send an SMS to my customer once they submit an estimate request (Gravity forms) We have the Hubspot plugin on gravity forms.

I'd like a simple SMS sent to my customers letting them know we received their information and if we can be of service. That way i don't have to reach out and contact.

Any ideas would be greatly appreciated.

HUGE BONUS: if i can use my existing cell phone# to send these.