Thanks. Yes, it seems clear that one may text from the Verizon system in the US to foreign numbers in some cases, based on Verizon agreements with the carrier the recipient is using. The problem is that there is no real way of knowing if your intended recipient can receive texts, unless you have corresponded with them this way previously and confirmed that it worked. If you occasionally text people on various systems around the world, it may work in some cases and not others. This is the problem with respect to reliability. In the US, you can pretty much assume that a text sent is a text received.