It seems that your problem wasn't not checking on the seed phrase, but not having any backups at all. You can have a backup in the form of wallet file, a private key, or a seed phrase conversion. Any of them will allow you to access the money and you don't really need to check on them. As for having a wallet on your phone and no backup you did at least a couple of "nono's" there.
It's not recommended to use phone as your main wallet without having a computer version anywhere because you carry that phone with you everywhere. The chances of it getting damaged or stolen are high and losing it will mean losing access to your money, even if you have a backup seed. Buying another phone and recovering your wallet can take a while and could give the thief enough time to guess your wallet password if it's weak enough. I'm not even going to start with people who use no passwords thinking that it's safe since they have a fingerprint scanner and are the only ones that use the device.