It is a custodian but the most trusted wallet(From the makers of Living Room of Satoshi BTC bill payment service)
Bitcoin Lightning Network(BLN) wallet. I found it is the simplest and the best wallet to receive and send Bitcoin by using both BLN(or on-chain Bitcoin). Your BTC will be spendable once you successfully transfer BTC from another wallet to this wallet.
There are three ways to top up your account.
Click on BUY BTC option, according to your location, it exhibits the option to buy BTC. Generally, Australian can directly buy BTC inside the app and non-Australian can purchase BTC on their third party partner site moonpay.io
Send BTC from another wallet to BTC address provided by Wallet of Satoshi
Send BTC from another wallet to address provided by Wallet of Satoshi through BLN
It supports QR Code, LNURL, and invoices generated from different platforms like Bitrefill. So receiving and sending BTC by using this wallet is really simple. Inside this wallet, you can find so many merchants to spend your BTC.
Remember ! If you do not sign up by using your email account, your all BTC amounts and data will be lost while clearing app data or uninstalling this wallet app !!
It supports both iOS and Android devices. So here are the links:-
https://play.google.com/store/apps/details?id=com.livingroomofsatoshi.wallet&hl=en_US
https://apps.apple.com/us/app/wallet-of-satoshi/id1438599608
https://www.walletofsatoshi.com/