The info is nowdays saved in "electrum_data" folder, anyone know other defaults it may have been from 2013 - 2015'ish?
Do you remember where you install Electrum on your phone, on internal memory or maybe SD card? If you hard reset your phone then you wipe that data, and since you have no seed it is difficult for you to hope to return your deleted data. Depending on the amount that was in that wallet you may consider advice from nc50lc and try some data recovery service.
Regarding daty directory, by some users it should be at :
/data/data/org.electrum.electrum/files/data/wallets , but you need to have rooted phone in order to find it.
I think he is talking about wallet.dat in electrum with windows OS
This must be a exact location C:\Users\admin\AppData\Roaming\Electrum\wallets
Note: if the username of your PC is not "admin" then change it with your own PC username so that you can directly find the electrum wallet folder.
If he is using a portable electrum then the files must be in the same folder.