I think Coinbase is multisig supported https://www.coinbase.com/multisig?locale=en
I have an account there but haven't tried to use it yet. They have a mobile app that can be downloaded over android but for me I dont suggest using your smart phone for any Bitcoin related transaction. If you lost your smart phone, someone can try to force their way in your BTC wallet.

Yes in the case of Coinbase its a four digit pin but what are the possibilities that someone that you know, someone close to you and someone who's been observing you might have had a glimpse on how you entered the 4 digit pin code special if its known that you have a stash of Bitcoins hidden somewhere. It's one thing that I don't like about technology, finances connected to a mobile phone which can be lost or stolen. BTW I'm still using an old bar phone.

of course such things as mobile apps are never safe because they can be easily hacked or the phone also might be hacked

Any other wallet are vulnerable and not safe if you let anyone else know your password or pin. Just create a secure pin that no one else will know.

Greenbits is a multi-signatory android bitcoin wallet that supports hardware wallets like Ledger and Trezor as well.