On July 7th I did a clean re-install of iOS 18.5 and then updated to the dev beta 3 of iOS 26 and since then the consumption of cell data has been really low. I started iOS 26 with none of my apps installed except My Data Manager and had nothing running for a few days then gradually reinstalled my apps and switched on location services, etc. It's used 192mb of cell data for system services since the update (avg 15mb/day) which is a massive drop compared to how it was on iOS 18.
For the past few days it's been back running as a 'normal' iphone & I'll definitely be updating to the public beta of 26 if/when it comes out this week as it seems way better running the new iOS (even in beta form) than 18.
For the past few days it's been back running as a 'normal' iphone & I'll definitely be updating to the public beta of 26 if/when it comes out this week as it seems way better running the new iOS (even in beta form) than 18.