Sorry but is Trust wallet really open source?
Who says that is so? It is a well-known fact that this wallet is not open source, and even that is clearly stated in the second post of this topic.
I knew about android phones since version 1.0 but till this day I have never seen a n android phone getting infected with malware, I don't think it's possible but correct me if I am wrong.
It is quite possible, Android is not immune to malware and viruses. I have personally seen some smartphones infected with very vicious malware that at that moment could not be removed in any way, not even a factory reset. I can't remember what that malware was called, although we mentioned it on the forum.
If you are interested in more, there are good articles that describe in detail some of the most dangerous malware that attack the Android OS, and how to prevent them - use the search engine and keywords.