OP check out
walletscrutiny. So there are open source wallets that are reproducible and reproducible.
According to them, unstoppable wallet seems to be the only multicurrency wallet that is open source and reproducible
Edge wallet is also multicurrency, open source but not reproducible
I will recommend you to use Trust wallet
Trustwallet isn't open source mate. Well they used to claim they were open source in the past but not anymore.
I have however not heard about these yet so be careful. Open Source is not always secure. Sadly enough, the best Cryptocurrency wallets with support for a lot of Altcoins turned from Open Source to Closed Source over time. For what reasons is a debatable topic.
You may want to look at that again.
He is right, by the way. Just because a wallet is open source does not make it bulletproof or the most secure.