coinomi for multiple crypto currency you want to stored.
Electrum also have mobile version that you can download in play store.
Are you only looking for bitcoin wallet because there are other wallet that can also be use for other coins such as ethereum and ethereum contract tokens.
I agree
Coinomi is a great option for newbies. Just store your seed in a paper in a secure place, never online.
I use it for years without any problems.
Electrum is good also for bitcoin only.