If you want an easy to use mobile wallet, try
Bitcoin Wallet for Android. This may be the easiest to use wallet. It is listed as recommended on
bitcoin.org and it's pretty secured. You can also try other wallets recommended on bitcoin.org.
For Android seed phrase bitcoin wallet, I can recommend Bluewallet and Electrum. There are others too, but I have these two on my Android device and I have tested it continuously many times with little funds on it. Electrum has released version with better user interface, although can not be compared with the desktop version which is better and have more features.
Bitcoin wallet for Android should be recommendable, provided if the user can backup his wallet file properly and externally. The wallet does not support seed phrase, it support only file backup which is also have to be encrypted. As the file backup is encrypted, I have not gotten a way to decrypt it in a way I can see the seed phrase unless you use the wallet for recovery, but encrypting the seed phrase is recommended.