Coinomi wallet is not that bad like many are saying, I still use the wallet even after thinking of going for other wallets after reading about many flaws and hacks, but the fact is I never seen a bad review or hack news about it's mobile wallet, the only one I heard bad reviews about is desktop wallet
It is more vulnerable to store the life savings in desktop or in online wallets, mobile wallets are not secure too. The used metadata is enough for brute-force and the thieves can found the password of the main wallet.