SMS and phone call notifications from free accounts originate from a shared phone number: +16505501770. We do not guarantee that the free account phone number stays the same.
Each Paid account has a dedicated phone number from the +1 (650) area code.
You should format the phone numbers with a + and country code, for example, +16175551212 (E.164 standard). We accept unformatted US/Canada numbers, e.g., (415) 555-1212, 415-555-1212, or 4155551212.
SMS messages and phone call scripts have a maximum length of 800 characters, including the actual merge tag values.