The first thing you have to do before you finish creating your wallet is to get a paper and backup your seed phrase in two or three different locations. If you think your seed phrase is not safe, you can use passphrase to extend the seed phrase and have the backup in separate locations.
Do you think another person have access to it?
It depends, but I think no because the your will likely password your phone and the person that have saw your phone or that stole it will only care about selling or using the phone after he formatted it already.