Not all mobile wallets have backup ,just because they are available for your smartphone doesnt mean they are reliable
Do not use mobile wallets with just username and passwords ,they are called online wallets ,they have no backup phrase or private keys.
For example I lost my bitcoin to xapo wallet since 2018 and they denied me of my coins after sending them mails.
Sorry about that, it is really risky to entrust our coin into a wallet that does not have backup phrase to recover account at any time, and there is nothing that the company you lost your coin to would have done to proof you are the rightful owner of the coin, if you cannot remember your password or your log in details.
I use exodus wallet, it is a desktop wallet though and I don’t think I have had any regret ever using this wallet, I have forgotten my password several times, but with the help of the my backup phrase, I was able to recover my wallet back, and I think people can check this EXODUS WALLET out, they really have nice features too, and you can exchange and swap some of your coins directly. Another great wallet that does not give any issue is the hard wallet, very reliable and cannot be hacked.