Since its hard to know what texting services or providers this will be successful on , what would be the purpose of it as we wouldn't really know if the person bombed even received the messages ?
If you're friends with them on Facebook or anything, you most likely will hear about it, especially if you send 1500. I'm surprised people are having difficulty, the method used should work very well for most big countries, especially us Canada and Mexico. It has to be a cell carrier, preferably a major one. Cheers