Bulk SMS Sender needed for LONG TERM work

I'm looking for immediate help from the right person. I need someone who can send 10,000+ SMS text messages to USA-based phone numbers PER DAY, meaning 50,000-70,000 per week.

The SMS would be text-only, no links. You will need to change the phone number multiple times per day to a specific area code that we will ask for. This is 100% required.

Requirements:

-Experience doing similar campaigns (please send proof)
-Ability to automatically send 10,000+ SMS text messages per day
-Ability to change the sending phone number multiple times per day

Please detail your experience with such campaigns. NO FIRST TIMERS.

Thank you!