I'm trying to verify several tw1tter accounts with permanent cell phone numbers. Ideally I'd like to use multiple USA sim cards rather than a virtual number, so I retain control of the numbers indefinitely. 2 questions. 1.) What carrier should I go with? 2.) I understand receiving SMS messages is generally free, but does that mean I simply need a sim and an activation, and I'm done? or will I need to retain a certain cash balance level on the number to be able to receive a text for verification and re-verification purposes? Basically my intentions are to verify all my social media accounts with the sim cards, and save them in case I'll ever need to re-verify. Any help is VERY appreciated!