Yes, I would say 1 day is about average if you use all the phone functions. You can extend battery life by limiting some of the functions but then no point having an S3 if that's what you are gonna do.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion.
This is not Customer Service so we are unable to help with account specific issues.Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)