It looks like this app drops received texts that are too big. I was getting complaints from friends about not responding to texts, and after doing some tests it looks like if a text that is too large comes in, it's silently dropped. I ran some tests using google voice and sure enough, if I send a large text it appears in iMessage broken into multiple parts, but it doesn't appear at all in this app. That's not good. At a minimum it should show you what it can and then say that the rest was truncated.