I'm a new Proton Mail user and I'm so grateful to have an easy-to-use option that is actually privacy-minded, beyond marketing claims obfuscating obscene amounts of private data collection and/or use. I'm exploring other Proton products, but I'm visiting the User Voice area to voice support for a Proton smartphone OS. I'm located in the US, so I'm not sure if additional options are more popular in the rest of the world but here the only options are effectively iOS and Android. I got my son a Nothing Phone, which is still pretty rare to see in the US, and we're really happy with it, but I feel like it's wanting for a non-Android OS option...consider coming through for us, please!