Second question is, can you get me the list of open source wallet since coinomi wallet is closed source? What about trust wallet is it truly an open source wallet? Thanks
You can read all about the vulnerability here:
https://bitcointalksearch.org/topic/warning-coinomi-wallet-critical-vulnerability-made-me-lose-my-life-savings-5114708If that's TL;DR; here's the short version:
It's not a backdoor, they used a library and didn't configure it properly, because of this the seed phrase was sent to google for spell-checking.
Eventough it was sent over SSL, somebody in google's HQ with access to the logs could easily parse them and find the unencrypted version of the seed.
There was a big discussion between coinomi and their victim, and in my opinion, coinomi took the low road... They defenately didn't handle the situation as they should have.
I would never touch coinomi with a foot pole. Making mistakes is human, bugs happen, but the way they reacted made me have an instant dislike for their company.
If you're holding a lot of different altcoins, you might aswell go for a ledger or a trezor instead of meddeling with closed source wallets stored on your smartphone (do look at the list of altcoins they support out of the box... )
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I stopped using Coinomi after reading this, it's really very important to check every issues that comes involving about the wallet you are using so you can transfer all your coins at the right time, just one report is enough to take action we are talking of your portfolio here where all your wealth are stored.