What amount of SMS per day do you recommend? I’ve read that X number of SMS may get a number blocked.
It really depends on many factors, for example carriers have their own rules on how to block a phone number. It also depends for example if you are using a regular long-distance phone number, or a toll-free phone number. With a regular long-distance phone number you can only send individual 1 to 1 SMS at a time, but with a toll-free you could send over 20 SMS per second.