Actually, when it comes to security issues, not only on the iPhone, Android or other devices are also vulnerable to security if they still store assets in some kind of application such as this trust wallet. However, the issues announced by the core trust wallet team may be more towards their internal security which is much different from the more complex android apps. In my opinion, we don't have to use trustwallet on iphone just before everything will announce it can be used safely. Maybe you can try some kind of trezor or some kind of hardware wallet.