I once sent 10k sms messages per month for about a year before my plan got cancelled. The plan officially allowed for unlimited sms. It was about 50$ per month,

I once sent 10k sms messages per month for about a year before my plan got cancelled. The plan officially allowed for unlimited sms. It was about 50$ per month, which was much cheaper than 0.1$ per message at Twilio (in Europe). I received the bill at the end of the month stating the timestamp and recipient of every message. The PDF was regularly around 100 pages long.