iPhone 1.1 Compatibility (Yes, it's compatible!)
With all the press around third-party apps being broken by the iPhone 1.1 update, there have been a few questions about whether or not Signal is compatible with the new firmware. The answer is absolutely yes. Web applications like Signal are supported by Apple and should always work. It is only native applications that require hacking of your iPhone that are being disabled.
While there are any number of cool things that Signal could do as a native application, this is the main reason it remains a web app. What Apple chooses to do with the iPhone is completely up to them, and it wouldn’t be right to sell a product that’s beyond our ability to support.