sms messaging

Does anyone know which numbers I can use to put on my usa paypal account? I just need to have a number on file so in the event that I ever get the message: "We're going to call/text you just to make sure that you own this account". I want to be able to have a number that can either receive a...

Heya guys facing a big problem here ... we need to deliver a lot of messages to customers (re-marketing) at around of 50K messages per day. Using gsm modems is not an option, using 3rd party sms gateways like twilio, plivo, nexmo its not an option as well as they slowly kick us out due to lots...